TST: [ArrowStringArray] more parameterised testing - part 2
only a few tests updated in this PR to ensure this approach is accepted.

if we try to add directly to the parametrization of the existing tests we get `ImportError` on environments without pyarrow installed. https://github.com/pandas-dev/pandas/pull/40679#discussion_r603345758
The failure looks like a flaky ResourceWarning related one. yes. but I restarted anyway.