Helm chart errors if using a SemVer2 chart version

[thomasv314]

A clear and concise description of what the bug is.

Expected results

Helm chart deploys when the chart version uses SemVer2

Actual results

 Error: release superset failed, and has been uninstalled due to atomic being set: Secret "superset-config" is invalid: metadata.labels: Invalid value: "superset-2021.13.1-79+44068e96a": a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue',  or 'my_value',  or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')

Screenshots

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How to reproduce the bug

Set the chart version.yaml to include a +, i.e. 2021.13.1-79+44068e96a

The superset-config resource errors out because it does not use the superset.chart function that all the other resources use

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

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