Rollup merge of #145676 - Oneirical:uncountable-integer-9, r=jieyouxu

Rehome 30 `tests/ui/issues/` tests to other subdirectories under `tests/ui/` [#2 of Batch #2]

Part of #133895

Methodology:

1. Refer to the previously written `tests/ui/SUMMARY.md`
2. Find an appropriate category for the test, using the original issue thread and the test contents.
3. Add the issue URL at the bottom (not at the top, as that would mess up stderr line numbers)
4. Rename the tests to make their purpose clearer

Inspired by the methodology that `@Kivooeo` was using.

r? `@jieyouxu`

Author: matthiaskrgr

tests/ui/array-slice-vec/pattern-matching-fixed-length-vectors-7784.rs renamed to tests/ui/array-slice-vec/fixed-length-vector-pattern-matching-7784.rs

@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/7092
 enum Whatever {
 }
 

tests/ui/array-slice-vec/matching-on-vector-slice-option-8498.rs renamed to tests/ui/array-slice-vec/vector-slice-matching-8498.rs

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-7092.rs:6:9
+  --> $DIR/method-call-nonsensical-pattern-binding-7092.rs:7:9
    |
 LL |     match x {
    |           - this expression has type `Whatever`

tests/ui/pattern/match-with-at-binding-8391.rs renamed to tests/ui/binding/match-with-at-binding-8391.rs

@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/54094
 //@ check-pass
 trait Zoo {
     type X;

tests/ui/issues/issue-7092.rs renamed to tests/ui/binding/method-call-nonsensical-pattern-binding-7092.rs

@@ -1,3 +1,4 @@
+// https://github.com/rust-lang/rust/issues/54462
 //@ run-pass
 //
 //@ compile-flags: -Ccodegen-units=1 -O

tests/ui/issues/issue-7092.stderr renamed to tests/ui/binding/method-call-nonsensical-pattern-binding-7092.stderr

@@ -1,5 +1,5 @@
 warning: method `dummy` is never used
-  --> $DIR/mut-trait-coercion-8248.rs:5:8
+  --> $DIR/coerce-mut-trait-object-8248.rs:5:8
    |
 LL | trait A {
    |       - method in this trait