refactor contentfinder and collectionloader to use ansible-doc where possible

[jctanner]

followup from #261

[jctanner]

@felixfontein is there anything I can add to the tests to catch whatever zuul was complaining about? Could you point me at the test that failed maybe?

[felixfontein]

@jctanner one Zuul failure is here: https://fa21944ca58e915dfb0e-2ed5cf1d0adaac8ad75a43940c07b553.ssl.cf5.rackcdn.com/7887/b16af21fec0dded0d7d168bc729ba7bc042b57b9/third-party-check/ansible-galaxy-importer/bcb5b9a/job-output.txt (PR: ansible-collections/community.general#7887)

The Zuul log looks for ERROR: in the importer output and fails if it finds such. In this case there is:

2024-01-23 06:52:12.622735 | controller | ERROR: Error running ansible-doc: cmd="/usr/bin/env ANSIBLE_COLLECTIONS_PATHS=/tmp/tmpbs6ghggh ANSIBLE_LOCAL_TEMP=~/.ansible/tmp ansible-doc --type filter --json community.general.version_sort community.general.unicode_normalize community.general.to_ini community.general.time community.general.random_mac community.general.lists_mergeby community.general.json_query community.general.jc community.general.hashids community.general.groupby_as_dict community.general.from_ini community.general.from_csv community.general.dict_kv community.general.dict community.general.crc32 community.general.counter" returncode="1" b'\''[DEPRECATION WARNING]: ANSIBLE_COLLECTIONS_PATHS option, does not fit var \nnaming standard, use the singular form ANSIBLE_COLLECTIONS_PATH instead. This \nfeature will be removed from ansible-core in version 2.19. Deprecation warnings\n can be disabled by setting deprecation_warnings=False in ansible.cfg.\nERROR! filter community.general.time missing documentation (or could not parse documentation): No documentation available for community.general.time (/tmp/tmpbs6ghggh/ansible_collections/community/general/plugins/filter/time.py)\n'\''

These errors should no longer happen due to #261.

[sonarcloud]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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