[clang-tidy] Move `clang-tidy-diff.py` to bin directory in WIN packaging

[vbvictor]

In #151467, found out that run-clang-tidy and clang-tidy-diff scripts are located in different folders in windows.

We should place both scripts in bin dir IMO.
Relevant code:

llvm-project/clang-tools-extra/clang-tidy/tool/CMakeLists.txt

Lines 65 to 71 in 740758a

	install(PROGRAMS clang-tidy-diff.py
	DESTINATION "${CMAKE_INSTALL_DATADIR}/clang"
	COMPONENT clang-tidy)
	install(PROGRAMS run-clang-tidy.py
	DESTINATION "${CMAKE_INSTALL_BINDIR}"
	COMPONENT clang-tidy
	RENAME run-clang-tidy)

Issue somewhat related to #90772

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: Baranov Victor (vbvictor)

In https://github.com//issues/151467, found out that `run-clang-tidy` and `clang-tidy-diff` scripts are located in different folders in windows.

We should place both scripts in bin dir IMO.
Relevant code:

llvm-project/clang-tools-extra/clang-tidy/tool/CMakeLists.txt

Lines 65 to 71 in 740758a

	install(PROGRAMS clang-tidy-diff.py
	DESTINATION "${CMAKE_INSTALL_DATADIR}/clang"
	COMPONENT clang-tidy)
	install(PROGRAMS run-clang-tidy.py
	DESTINATION "${CMAKE_INSTALL_BINDIR}"
	COMPONENT clang-tidy
	RENAME run-clang-tidy)

Issue somewhat related to #90772

[carlosgalvezp]

How come it only happens on Windows? The folders should be different also on Windows Linux?

Unrelated (might open a separate ticket): I believe we should also remove the RENAME part of run-clang-tidy and simply keep it with the .py extension so it's clear it's a Python script.

[vbvictor]

How come it only happens in Windows? The folders should be different also in Windows?

I will check where different scripts are installed on Linux/Win in the upcoming days, right now just created the issue to not forget about this "bug".

[vbvictor]

Both in Linux and Windows, scripts are placed in different directories in default CMAKE install scripts. However, in Linux, there are symlinks to /usr/bin/ which are provided by some package managers (at least debian).

In Linux we have:
/usr/bin/run-clang-tidy -> /usr/lib/llvm-20/bin/run-clang-tidy
/usr/bin/clang-tidy-diff -> /usr/lib/llvm-20/share/clang/clang-tidy-diff.py

On packaging level, .py is stripped from clang-tidy-diff.py.
Generally, I'm afraid that with renaming we may break packaging scripts that are outside LLVM repo, which is unfortunate. I will ask in the release channel if we can make the renaming with little blood.

[vbvictor]

In Windows, I guess nobody tried to make symlinks so binaries are delivered as is in CMAKE.