Add pylint-pytest plugin #3034

Job	Run time
gatekeeper	6s
env	1s
changes	4s
documentation / build	15s
windows / build	4m 35s
mac / build	7m 27s
ubuntu / build	6m 39s
guitest_draft / run (windows-latest)	2m 5s
scripttest_draft / run	1m 6s
application_tester_draft / run (ubuntu-latest)	3m 16s
coverage_draft / generate and upload	3m 19s
guitest / run (ubuntu-latest)	1m 2s
pytest / run (windows-latest)	6m 12s
guitest / run (macos-latest)	1m 7s
pytest / run (macos-latest)	3m 37s
application_tester / run (windows-latest)	4m 50s
application_tester / run (macos-latest)	3m 8s
	48m 49s

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