sdks/python/scripts: support pytest user markers

[mohamedawnallah]

Description

This change set allow us to pass user-defined pytest markers.

Towards #35598.
Towards #35577.
Related https://lists.apache.org/thread/d1dkpsfl5yj8p1mod4oscj1m846yo64b.

Motivation and Context

It implements @damccorm's proposed solution #35598 (comment)

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[mohamedawnallah]

apache_beam.testing.util.BeamAssertException: Failed assert: ['a'] == ['a', 'b'], unexpected elements ['b'] [while running 'assert_that/Match']

The failures of this CI workflow beam_PreCommit_Python_Coverage are unrelated to the change set this PR introduce

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[damccorm]

Sorry - missed this! It LGTM, thank you!

I will let checks complete before merging

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