Fix slack integration for e2e tests #14676

Job	Run time
Run helm unit tests	6s
Run unit tests	4m 19s
Run helm linting	5s
Run linting	2m 56s
Check uncommitted changes in api docs action	1m 55s
Check generated files	10s
Lint markdown files	37s
Code security scanning alerts	28s
Prepare properties	4s
Build images (amd64)	3m 19s
Build images (arm64)	4s
Build images (ppc64le)	5s
Build images (s390x)	4s
Push images (amd64)	21s
Push images (arm64)	7s
Push images (ppc64le)	4s
Push images (s390x)	6s
Create manifest	8s
	14m 58s

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