Fix test_index_advanced_filter API test re-running

[nsoranzo]

At the end of this test one history is made public. So, when re-running the API tests locally without wiping the database, the public history was also included in the results from the searches, causing the following error:

            name_contains = "history"
            query = f"?search={name_contains}"
            index_response = self._get(f"histories{query}").json()
>           assert len(index_response) == 3
E           AssertionError: assert 4 == 3
E            +  where 4 = len([{'annotation': None, 'archived': False, 'contents_url': '/api/histories/3393d74dbae390cc/contents', 'count': 0, ...}, {'annotation': None, 'archived': False, 'contents_url': '/api/histories/8cf91205f2f737f4/contents', 'count': 0, ...}, {'annotation': None, 'archived': False, 'contents_url': '/api/histories/b5065b03be4c41dc/contents', 'count': 0, ...}, {'annotation': None, 'archived': False, 'contents_url': '/api/histories/d9abeb98649a6a7e/contents', 'count': 0, ...}])

lib/galaxy_test/api/test_histories.py:194: AssertionError

Similarly, in the last part of the test the number of published histories was growing at each re-run.

Also removed a redundant test.

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
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