feat: Wiring OIDC env vars

[jthakkar04]

Adds an oidc source type to the env-var resolver that maps the four spec.wandb.oidc secret selectors onto the gorilla container as secretKeyRef env vars, emitting nothing when OIDC is unconfigured, so the server-manifest's type: oidc entries actually reach the app and enable OIDC/SSO login

Relevant PR: https://github.com/wandb/core/pull/45652

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