[clang-tools-extra] [clang-tidy][NFC] Don't qualify names unless strictly necessary (PR #185169)

[Victor Chernyakin via cfe-commits]

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@@ -42,7 +42,7 @@ class UnnecessaryCopyInitializationCheck : public ClangTidyCheck {
     const VarDecl &Var;
     const Stmt &BlockStmt;
     const DeclStmt &VarDeclStmt;
-    clang::ASTContext &ASTCtx;
+    ASTContext &ASTCtx;
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localspook wrote:

>From a cursory glance, making it const would require making a bunch of helper functions in the `.cpp` take it by const reference, which would require making `utils::fixit::changeVarDeclToReference` take it by const reference... I think it *could* be const, but chasing down all the places warrants a different PR

https://github.com/llvm/llvm-project/pull/185169