[Fleet] Add automatic agent upgrades functional tests #220829
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Summary
Closes https://github.com/elastic/ingest-dev/issues/5303
This PR adds functional tests for automatic upgrades of Fleet agents.
The test cases aim to cover the logic of whether agents should be upgraded or not in a single run.
Checklist
release_note:*
label is applied per the guidelinesIdentify risks
No impact on functionality. Risk of functional tests flakiness.