Resolve "<LANG>_CLANG_TIDY interferes with <LANG>_COMPILER_LAUNCHER"

When using ccache with clang-tidy, ccache needs to wrap compiler invocation, rather than cmake innvocation.

This fix reverses the relationship between tidy-like runners and ccache-like runners, so if both are specified, the command line changes from:

ccache cmake -E __run_co_compile --tidy=clang-tidy ... -- g++ ...

to:

cmake -E __run_co_compile --tidy=clang-tidy ... -- ccache g++ ...

Fixes: #16493 (closed)