Remove "OIDC_AUTH_URL" env variable from service configuration

[DnPlas]

Context

The OIDC_AUTH_URL is used to initiate the Authorization Code Flow. This client is actually capable of discovering this value by hitting the OIDC provider's (e.g. Dex) .well-known endpoint, so as long as the OIDC provider is exposing this information, it should be enough.

Right now, this value is hard coded to /dex/auth, and while it is not incorrect, it is preferred that the OIDC provider (in this case dex-auth) sets it, in the end this is the charm that will know this information. oidc-gatekeeper on its side can just infer it in order to keep these values accurate and equal in both charms.

This task depends on canonical/dex-auth-operator#202

What needs to get done

Remove the OIDC_AUTH_URL env variable and allow the client to infer it form dex-auth's .well-known endpoint.

Definition of Done

The oidc-gatekeeper does not depend on the variable for initiating the Authorization flow.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5970.

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