[clang] [llvm] Ci report bash (PR #113660)

[David Spickett via cfe-commits]

DavidSpickett wrote:

Example failing build: https://buildkite.com/llvm-project/github-pull-requests/builds/113045#_
Another example: https://buildkite.com/llvm-project/github-pull-requests/builds/113055#_

The second example should not be failing but this modulemap test is for whatever reason, probably a mistake from me. If this approach is chosen I'll fix that and expand this to Windows and cleanup everything else.

But it's at a point where you can look at the changes to `.ci/monolithic-linux.sh` and compare to https://github.com/llvm/llvm-project/pull/113447 which uses the lit feature to get unique file names.

https://github.com/llvm/llvm-project/pull/113660