feat(chart): Release for v0.20.0

[vflaux]

What does it do ?

This PR updates the Helm chart for the v0.20.0 release.

Closes #5960

Also pin helm to v3.19.2 because plugins are not yet compatible with v4 (no verification support & flags handling issues).

Motivation

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[coveralls]

Pull Request Test Coverage Report for Build 20070175155

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.679%

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Totals
Change from base Build 20069516202:	0.0%
Covered Lines:	16008
Relevant Lines:	20346

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💛 - Coveralls

[k8s-ci-robot]

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