AMDGPU: add hotswap entry trampoline lit coverage

[harsh-amd]

Stack:

1. AMDGPU: add hotswap entry trampoline core #3008 - core hotswap entry trampoline implementation, unit coverage, and minimal public LIT coverage.
2. This PR - expanded LIT coverage layered on top of AMDGPU: add hotswap entry trampoline core #3008.

The base branch users/harsh/comgr-hotswap-entry-core mirrors the #3008 head so GitHub shows this as an incremental stack diff.

Summary:

• Adds default-disabled and explicitly disabled entry-trampoline checks.
• Adds idempotency coverage for already-rewritten entry trampolines.
• Adds B0/A0 stepping interaction coverage.
• Adds gfx12.5-family and multi-kernel LIT coverage.
• Keeps broader public API/LIT coverage separate from the core implementation PR.

Verification:

• Rebased onto AMDGPU: add hotswap entry trampoline core #3008 core at 1de7a53.
• cmake --build build --target HotswapMCTests HotswapElfTests hotswap-rewrite -- -j8 passed.
• build/bin/HotswapMCTests passed: 36 tests.
• build/bin/HotswapElfTests passed: 13 tests.
• build/bin/llvm-lit -sv build/tools/comgr/test-lit --filter hotswap passed: 53 tests.
• git diff --check rocm/amd-staging...HEAD passed on the stack top.
• The final stack tip remains tree-identical to the previous full top-of-stack before moving minimal LIT coverage into AMDGPU: add hotswap entry trampoline core #3008.