fix: idempotent helm installations for demos/stacks and ignoring of existing jobs #352

Job	Run time
General Pull Request Checks / Run Cargo Deny (bans licenses sources)	43s
General Pull Request Checks / Run Cargo Udeps	25m 50s
General Pull Request Checks / Run Cargo Deny (advisories)	49s
General Pull Request Checks / Run RustDoc	17m 7s
General Pull Request Checks / Run Cargo Tests	16m 38s
General Pull Request Checks / All tests passed	2s
Helm Chart Check	1m 8s
Publish arm64 Image	14m 2s
Publish amd64 Image	25m 38s
Build and publish manifest list	41s
	1h 42m 38s

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