[clang] [Sema][NFC] Move two misplaced uninit tests to clang/test/SemaCXX (PR #128013)

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

Looks good! I wonder if we should rename the directory to something like `clang/test/StaticAnalyzer` to avoid confusion in the future.

https://github.com/llvm/llvm-project/pull/128013