Support OIDC as a provider for Group SSO on GitLab.com

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Background

Today, Open ID Connect (OIDC) as a provider is only supported in self-managed GitLab.

https://docs.gitlab.com/ee/integration/openid_connect_provider.html

Proposal

Support OIDC provider based flows on GitLab.com.

Edited by 🤖 GitLab Bot 🤖