[AMDGPU] Make default AMDHSA Code Object Version to be 5 (#65410)
Also update LIT tests and docs. For more details, see https://llvm.org/docs/AMDGPUUsage.html#code-object-v5-metadata Reviewed By: arsenm, jhuber6 Github PR: #65410 Differential Revision: https://reviews.llvm.org/D129818
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