Add more tests and add back validation for some agents #2633

Job	Run time
CLI End to End tests	9m 25s
End to End tests (Python, python)	20m 52s
Unit tests (Runtime)	8m 40s
End to End tests (Other, other)	21m 57s
Unit tests (Runtime IT)	20m 18s
Unit tests (Deployer)	9m 35s
Unit tests (Api Gateway)	6m 52s
Unit tests (Control plane)	5m 33s
Unit tests (Other)	12m 1s
Unit tests (Style)	6m 43s
	2h 1m 56s

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