Suggestion to update llvm-cxxfilt logic (#6451)gh-11685

(1) Restore explicit specification of
`group.*.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt`
for all clang compiler groups, except bpf and windows.
(2) Make the ClangCompiler` constructor adjust the path of
`llvm-cxxfilt`, so that a compiler-local version is preferred, if one
exists.
(3) Pass-by update: bump the version of llvmDisassembler from clang-14
to clang-18.1.

Hopefully this addresses all demangling issues known so far.

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