Add more tests and add back validation for some agents #2632

Job	Run time
CLI End to End tests	9m 20s
End to End tests (Python, python)	16m 35s
Unit tests (Runtime)	9m 1s
End to End tests (Other, other)	15m 39s
Unit tests (Runtime IT)	15m 28s
Unit tests (Deployer)	9m 8s
Unit tests (Api Gateway)	7m 5s
Unit tests (Control plane)	7m 2s
Unit tests (Other)	9m 31s
Unit tests (Style)	5m 6s
	1h 43m 55s

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