Retry flakey tests

[hmstepanek]

Overview

Add a retry decorator and retry test_no_data_loss_on_reconnect and test_priority_used_in_transaction_events flakey tests.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	3	0	0	0.74s
✅ PYTHON	flake8	3		0	0.43s
✅ PYTHON	isort	3	0	0	0.17s
✅ PYTHON	pylint	3		0	3.06s

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