[llvm] [ci] limit parallel windows compile jobs to 24 (PR #93329)

[Vlad Serebrennikov via llvm-commits]

Endilll wrote:

> FWIW, I see this from a clangd test with some regularity:
> 
> ```
> timeout=1200 --time-tests C:/ws/src/build/tools/clang/tools/extra/include-cleaner/test C:/ws/src/build/tools/clang/tools/extra/pseudo/test C:/ws/src/build/tools/clang/tools/extra/clangd/test/../unittests C:/ws/src/build/tools/clang/tools/extra/clangd/test C:/ws/src/build/tools/clang/tools/extra/test"
> ```
> 
> from https://buildkite.com/llvm-project/github-pull-requests/builds/65934

This was fixed in #92888. Make sure your branches are up to date.

https://github.com/llvm/llvm-project/pull/93329