[CORL-3204] set optional flags on OIDC validator schema

[nick-funk]

What does this PR do?

Sets the optionals for the JWT processed during the OIDC verifier flow.

• Different providers give different fields for name, username, preferred_username, picture, etc
• Handle these optionals so that folks can use Sign in with Apple

These changes will impact:

• commenters
• moderators
• admins
• developers

What changes to the GraphQL/Database Schema does this PR introduce?

None

Does this PR introduce any new environment variables or feature flags?

No

If any indexes were added, were they added to INDEXES.md?

N/A

How do I test this PR?

• Create an Apple ID with developer access
• Hook up a Sign in with Apple api key with provider url's
• Set the configuration under Admin > Configure > Authentication > Login with OpenID Connect
• Attempt to login/register with Apple via the new OIDC login button that is now available in stream
• See that it works

Were any tests migrated to React Testing Library?

No

How do we deploy this PR?

• Merge into develop

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