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Add more flow control agents: timer-source and trigger-event #2174

Job	Run time
End to End tests (Python, python)	19m 20s
Unit tests (Runtime)	6m 0s
End to End tests (Other, other)	16m 57s
Unit tests (Runtime IT)	16m 47s
Unit tests (Deployer)	8m 3s
Unit tests (Api Gateway)	3m 31s
Unit tests (Control plane)	3m 44s
Unit tests (Other)	10m 3s
Unit tests (Style)	3m 45s
	1h 28m 10s

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