tests: Remove redundant integration pytest markers

Chandan Singhrequested to merge
chandan/remove-redundant-pytest-mark into master

Remove pytest.mark.integration for individual tests that already include it in pytestmarker at the top.

FWIW the list of such files was found using:

    git grep --name-only 'pytestmark = pytest.mark.integration' | xargs grep '@pytest.mark.integration'

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