Oauth should be configurable when deploying through helm

[vfoucault]

Is your feature request related to a problem? Please describe.
When deploying Superset through the provider helm chart, Oauth is not configurable.

Describe the solution you'd like
A clear and concise description of what you want to happen.
A helm chart implementation to configure Oauth when specified

Describe alternatives you've considered
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Using a custom helm chart,

Additional context
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n/a

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