Fix spelling errors in copilot-environment workflow

Co-authored-by: LarryOsterman <[email protected]>

Author: Copilot

.vscode/cspell.json

@@ -45,6 +45,7 @@
     "dotenv",
     "downcasted",
     "downcasting",
+    "dtolnay",
     "entra",
     "etag",
     "eventhub",
@@ -153,6 +154,12 @@
         "rust-custom"
       ]
     },
+    {
+      "filename": ".github/workflows/*.yml",
+      "dictionaries": [
+        "rust-custom"
+      ]
+    },
     {
       "filename": "sdk/core/azure_core_amqp/**",
       "dictionaries": [