CI: relative cache and enable --warn=all #30847
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Description [](A description of the bug and the fix. Also link any relevant issues.)
For #30161 and #29500, currently using relative path for building everywhere, added GHA unit test to see if the name of the workspace appears in the build log of GHA. The caching time should be the same as before.
Update 12/26/2023:
Changed GHA unittest to Python unittest. Fix violations when enable --warn=all.