Migrate from Drupal oauth to Keycloak auth for API calls

As part of the migration from Drupal, we are moving Drupal OAuth calls to instead be served by Keycloak where possible. OpenVSX uses a drupal token as authentication to this API to validate and retrieve certain user data. This should be replaced with a new client making use of our community realm in Keycloak.

This change should be pushed in concert with a change to the open-vsx site switchover to using Keycloak to reduce downtime.

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Downstream issue created: https://github.com/eclipse/openvsx/issues/1139

Until that has been actioned, we can't go live with these changes as it would break the site.

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