[CI] Clarify why KernelAndProgram/disable-caching change broke backward compatibility#19822

Alexandr-Konovalov wants to merge 3 commits intointel:syclintel/llvm:syclfrom

Alexandr-Konovalov:Alexandr-Konovalov/explain-disable-cachingAlexandr-Konovalov/llvm:Alexandr-Konovalov/explain-disable-cachingCopy head branch name to clipboard