test(config-utilities): cover cj/--recompile-emacs-home

Six tests against real temp directories. Mocks only the actual
compile invocations (native-compile-async, byte-recompile-directory)
so the deletion side runs end-to-end against real files.

Covers: native dispatch returns 'native and calls native-compile-async,
byte dispatch returns 'byte and calls byte-recompile-directory,
recursive deletion of every .elc/.eln (including in subdirs), removal
of the eln cache dir on the native path, removal of the elc cache dir
on the byte path, and the missing-cache-dir no-op.

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