fix : Exclude unpublished courses from catalog content metadata API

[vshaikismail-sonata]

Root cause:-
The the active status filtering was conditionally applied only when no [content_keys_filter] was provided. When specific content keys were requested, the filtering was skipped, allowing inactive courses to slip through.

Changes:-
-Removed the conditional check: Eliminated the if not content_keys_filter: block
to ensure filtering runs unconditionally.
-Unindented the filtering logic: Moved the queryset = [item for item in queryset if self.is_active(item)]
and related debug logging outside the conditional, so it's executed for all requests.
-Updated the comment: Changed to # Always filter out inactive courses to ensure only active content is always returned via API.
-Added unit tests to verify inactive courses are filtered out, and all the test cases were successful.

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[mphilbrick211]

Welcome, @vshaikismail-sonata, and thank you for this contribution! Please let me know if you have any questions regarding submitting a CLA form.