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Add a "CPU (clang trunk, Debug, modules)" row to the CPU matrix that builds Clang from llvm-project at a pinned commit and uses it for the modular build. The pin is the merge of llvm/llvm-project#224528 (f970f59a9d4e), which fixes the nondeterministic Clang 23.1.0 ICE in ImplicitConceptSpecializationDecl deserialization (llvm/llvm-project#191361) that the modular build hits. The job reuses the existing llvm22 rapidsai devcontainer image. It builds a stripped Release toolchain limited to what the modular build needs (clang, its resource headers, clang-scan-deps, and libc++/libc++abi/libunwind) and caches it keyed on the commit and image tag, saving the cache explicitly so a failing stdexec build doesn't discard it. Only bumping llvm_sha or the image tag triggers a rebuild. Rows without llvm_sha are unaffected: the new steps are skipped and the configure line falls back to the image's libc++.modules.json as before.
The Clang 22 modules row was allowed to fail because every released 22.1.x ICEs in the modular build. The from-source row now covers the modular build with a compiler that doesn't, so the Clang 22 row adds nothing. Update MAINTAINERS.md to say which compiler the modular build is tested with.
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This changes replaces the existing modular Clang 22 build with a Clang 24 build that builds Clang from source before building stdexec. It pins Clang 24 to the commit that resolved the ICE that plagued Clang 22 and 23.
The Clang build is cached separately from the stdexec build so that it should only have to be built once.
The first build will fail until this change is rebased on #2307.