Clean up some arrow-flight tests and duplicated code #6725
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Which issue does this PR close?
This is a part of the changes in #6690
What changes are included in this PR?
Some cleanups for test files that I felt make them much more understandable and removes some duplicated code within tests.
Rationale for this change
This makes these tests easier to understand along with pulling out code from the massive PR that is #6690 in order to make it easier to review.
Are there any user-facing changes?
No