[clang] [clang-tools-extra] Remove clang-rename (PR #108988)

[via cfe-commits]

cor3ntin wrote:

can you inspect these files that still reference clang-rename?

```
lib/Tooling/Refactoring/Rename/RenamingAction.cpp:        errs() << "clang-rename: renamed at: " << SourceMgr.getFilename(FullLoc)
lib/Tooling/Refactoring/Rename/USRFindingAction.cpp:            "clang-rename could not find symbol (offset %0)");
lib/Tooling/Refactoring/Rename/USRFindingAction.cpp:          DiagnosticsEngine::Error, "clang-rename could not find symbol %0");
```

https://github.com/llvm/llvm-project/pull/108988