[1.15] Add --wait to helm tests and other improvements to support CD tools #8742
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Description
Backport of #8738
Most CI tools wait until resources are ready to mark a release as successful. Eg. ArgoCD and Flux
We can emulate this by passing the --wait flag to helm rather than individually adding support for every CD tool out there.
This PR adds this flag to the helm tests as well as some tweaks to support ArgoCD
Docs changes
Context
Users ran into this bug doing ... \ Users needed this feature to ...
See slack conversation here
Interesting decisions
We chose to do things this way because ...
Testing steps
I manually verified behavior by ...
Notes for reviewers
Be sure to verify intended behavior by ...
Please proofread comments on ...
This is a complex PR and may require a huddle to discuss ...
Checklist: