Add more tests and add back validation for some agents #2623

Job	Run time
CLI End to End tests	5m 18s
End to End tests (Python, python)	4m 15s
Unit tests (Runtime)	3m 49s
End to End tests (Other, other)	5m 15s
Unit tests (Runtime IT)	3m 43s
Unit tests (Deployer)	3m 49s
Unit tests (Api Gateway)	4m 3s
Unit tests (Control plane)	4m 9s
Unit tests (Other)	3m 47s
Unit tests (Style)	3m 39s
	41m 47s

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