Add authorization_endpoint field in Dex's configuration

[DnPlas]

Context

Adding the authorization_endpoint field in the configuration will allow OIDC clients, such as oidc-gatekeeper, to automatically know the endpoint they should use for starting the Authorization Code Flow.

This is useful because by having this information available in Dex's .well-known endpoint will allow reducing the required configuration for oidc-gatekeeper, as it will automatically infer it.

What needs to get done

1. Add "authorization_endpoint": "/dex/auth"as part of these lines

Definition of Done

The .well-known endpoint shows this information and OIDC clients can use it. To verify this we can curl -v <dex-issuer-url>/dex/.well-known/openid-configuration

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5965.

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