Add yank_message field to API version responses

src/tests/krate/publish/snapshots/all__krate__publish__links__crate_with_links_field-2.snap

@@ -45,6 +45,7 @@ expression: response.json()
     "readme_path": "/api/v1/crates/foo/1.0.0/readme",
     "rust_version": null,
     "updated_at": "[datetime]",
+    "yank_message": null,
     "yanked": false
   }
 }

src/tests/krate/publish/snapshots/all__krate__publish__manifest__boolean_readme-2.snap

@@ -45,6 +45,7 @@ expression: response.json()
     "readme_path": "/api/v1/crates/foo/1.0.0/readme",
     "rust_version": "1.69",
     "updated_at": "[datetime]",
+    "yank_message": null,
     "yanked": false
   }
 }

src/tests/krate/publish/snapshots/all__krate__publish__manifest__lib_and_bin_crate-2.snap

@@ -48,6 +48,7 @@ expression: response.json()
     "readme_path": "/api/v1/crates/foo/1.0.0/readme",
     "rust_version": null,
     "updated_at": "[datetime]",
+    "yank_message": null,
     "yanked": false
   }
 }

src/tests/routes/crates/snapshots/all__routes__crates__read__show.snap

@@ -71,6 +71,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/foo_show/1.0.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     },
     {
@@ -103,6 +104,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/foo_show/0.5.1/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     },
     {
@@ -135,6 +137,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/foo_show/0.5.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/snapshots/all__routes__crates__reverse_dependencies__prerelease_versions_not_included_in_reverse_dependencies.snap

@@ -51,6 +51,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c3/1.0.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/snapshots/all__routes__crates__reverse_dependencies__reverse_dependencies.snap

@@ -51,6 +51,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c2/1.1.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/snapshots/all__routes__crates__reverse_dependencies__reverse_dependencies_includes_published_by_user_when_present.snap

@@ -63,6 +63,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c3/3.0.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     },
     {
@@ -89,6 +90,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c2/2.0.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/snapshots/all__routes__crates__reverse_dependencies__reverse_dependencies_query_supports_u64_version_number_parts.snap

@@ -51,6 +51,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c2/1.0.18446744073709551615/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/snapshots/all__routes__crates__reverse_dependencies__reverse_dependencies_when_old_version_doesnt_depend_but_new_does.snap

@@ -51,6 +51,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c2/2.0.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/snapshots/all__routes__crates__reverse_dependencies__yanked_versions_not_included_in_reverse_dependencies.snap

@@ -51,6 +51,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/c2/2.0.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/versions/snapshots/all__routes__crates__versions__list__versions.snap

@@ -28,6 +28,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/foo_versions/1.0.0/readme",
       "rust_version": "1.64",
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     },
     {
@@ -60,6 +61,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/foo_versions/0.5.1/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     },
     {
@@ -92,6 +94,7 @@ expression: response.json()
       "readme_path": "/api/v1/crates/foo_versions/0.5.0/readme",
       "rust_version": null,
       "updated_at": "[datetime]",
+      "yank_message": null,
       "yanked": false
     }
   ]

src/tests/routes/crates/versions/snapshots/all__routes__crates__versions__read__show_by_crate_name_and_semver_no_published_by.snap

@@ -27,6 +27,7 @@ expression: json
     "readme_path": "/api/v1/crates/foo_vers_show_no_pb/1.0.0/readme",
     "rust_version": null,
     "updated_at": "[datetime]",
+    "yank_message": null,
     "yanked": false
   }
 }

src/tests/routes/crates/versions/snapshots/all__routes__crates__versions__read__show_by_crate_name_and_version.snap

@@ -33,6 +33,7 @@ expression: json
     "readme_path": "/api/v1/crates/foo_vers_show/2.0.0/readme",
     "rust_version": "1.64",
     "updated_at": "[datetime]",
+    "yank_message": null,
     "yanked": false
   }
 }

src/views.rs

@@ -558,6 +558,7 @@ pub struct EncodableVersion {
     pub downloads: i32,
     pub features: serde_json::Value,
     pub yanked: bool,
+    pub yank_message: Option<String>,
     pub lib_links: Option<String>,
     // NOTE: Used by shields.io, altering `license` requires a PR with shields.io
     pub license: Option<String>,
@@ -586,6 +587,7 @@ impl EncodableVersion {
             downloads,
             features,
             yanked,
+            yank_message,
             links: lib_links,
             license,
             crate_size,
@@ -613,6 +615,7 @@ impl EncodableVersion {
             downloads,
             features,
             yanked,
+            yank_message,
             lib_links,
             license,
             links,
@@ -736,6 +739,7 @@ mod tests {
             downloads: 0,
             features: serde_json::from_str("{}").unwrap(),
             yanked: false,
+            yank_message: None,
             license: None,
             lib_links: None,
             links: EncodableVersionLinks {