Fix memory leaks in ext/tidy basedir restriction code

TIDY_APPLY_CONFIG can early return because it's a macro, but then the
cleanup paths are not executed. Transform this to a real funct

Fix memory leaks in ext/tidy basedir restriction code

TIDY_APPLY_CONFIG can early return because it's a macro, but then the
cleanup paths are not executed. Transform this to a real function and
handle the cleanups correctly at the callsites.

Closes GH-15046.

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