feat(cas-backends): When updating CAS Backends events are sent (#2415) #284

Job	Run time
test / Test (cli)	2m 10s
test / Test (main-module)	4m 16s
test / Test (controlplane)	6m 55s
test / Test (artifact-cas)	59s
init_attestation	7s
Release CLI and control-plane/artifact-cas container images	13m 17s
Finish Attestation	11s
modify_release_notes	10s
	28m 5s

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