[clang-tools-extra] [clang-tidy] Add redundant qualified alias check (PR #180404)

[Baranov Victor via cfe-commits]

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@@ -0,0 +1,176 @@
+// RUN: %check_clang_tidy -std=c++11-or-later %s readability-redundant-qualified-alias %t
+// RUN: %check_clang_tidy -check-suffix=NS -std=c++11-or-later %s readability-redundant-qualified-alias %t -- \
+// RUN:   -config='{CheckOptions: { readability-redundant-qualified-alias.OnlyNamespaceScope: true }}'
+// RUN: %check_clang_tidy -check-suffixes=,CXX23 -std=c++23 %s readability-redundant-qualified-alias %t
+// RUN: %check_clang_tidy -check-suffixes=NS,NS-CXX23 -std=c++23 %s readability-redundant-qualified-alias %t -- \
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vbvictor wrote:

```suggestion
// RUN: %check_clang_tidy -check-suffixes=NS,NS-CXX23 -std=c++23-or-later %s readability-redundant-qualified-alias %t -- \
```

https://github.com/llvm/llvm-project/pull/180404