ci: Notify slack of `codegen` failures (#5273) #2973

Job	Run time
resolve / resolve	5s
e2e-matrix / e2e-upgrade / suite-upgrade	2h 23m 15s
e2e-matrix / e2e (Drift) / suite-Drift	39m 51s
e2e-matrix / e2e (Chaos) / suite-Chaos	40m 11s
e2e-matrix / e2e (Consolidation) / suite-Consolidation	46m 5s
e2e-matrix / e2e (Expiration) / suite-Expiration	44m 28s
e2e-matrix / e2e (Integration) / suite-Integration	44m 57s
e2e-matrix / e2e (Interruption) / suite-Interruption	40m 4s
e2e-matrix / e2e (IPv6) / suite-IPv6	41m 38s
e2e-matrix / e2e (NodeClaim) / suite-NodeClaim	44m 7s
	8h 4m 41s

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