refactor(config-utilities): extract cj/--delete-compiled-files-in-dir

Splits the file-walking work out of cj/delete-emacs-home-compiled-files
so it takes a directory parameter and returns a count. The interactive
wrapper still hardcodes user-emacs-directory and prints the same
status messages, just with the count interpolated.

The split is scope-aligned with adding tests for the file-walking
behaviour. The original function couldn't be tested without spawning
files inside user-emacs-directory itself, which would pollute the
running config.

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