Change src/test to tests in source files, fix tidy and tests

Author: albertlarsan68

crates/hir-def/src/macro_expansion_tests/mbe/meta_syntax.rs

@@ -94,7 +94,7 @@ macro_rules! m2 { () => ( ${invalid()} ) }
 
 #[test]
 fn test_rustc_issue_57597() {
-    // <https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-57597.rs>
+    // <https://github.com/rust-lang/rust/blob/master/tests/ui/issues/issue-57597.rs>
     check(
         r#"
 macro_rules! m0 { ($($($i:ident)?)+) => {}; }

crates/ide-db/src/generated/lints.rs

@@ -3624,7 +3624,7 @@ of a library.
 Plugins can extend [Rust's lint
 infrastructure](../../reference/attributes/diagnostics.md#lint-check-attributes) with
 additional checks for code style, safety, etc. Now let's write a plugin
-[`lint-plugin-test.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui-fulldeps/auxiliary/lint-plugin-test.rs)
+[`lint-plugin-test.rs`](https://github.com/rust-lang/rust/blob/master/tests/ui-fulldeps/auxiliary/lint-plugin-test.rs)
 that warns about any item named `lintme`.
 
 ```rust,ignore (requires-stage-2)