[1.2.x] chore(auth): add default resolver for OIDC auth provider

[openshift-cherrypick-robot]

This is an automated cherry-pick of #1326

/assign Zaperex

[openshift-ci[bot]]

Hi @openshift-cherrypick-robot. Thanks for your PR.

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[sonarcloud[bot]]

Quality Gate passed

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[github-actions[bot]]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1329!

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Zaperex

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/janus-idp/backstage-showcase/blob/1.2.x/OWNERS)~~ [Zaperex] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment