feat: Save SSO provider UserId in preference

Description

We need to access SSO provider's UID to make some SSO queries (ex: syncing 2FA state). We can retrieve this uid from accessToken's sub claim. We can save this uid on nextcloud's user preference.

Screenshots

Technical details

Tests

Issues

• https://gitlab.e.foundation/e/infra/backlog/-/issues/4352+s

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