[24.2] Show Keycloak provider label in UI

[ahmedhamidawan]

Fixes #19410

If there is a <label> provided in oidc_backends_config, we show that in the UI instead of just the provider name.

For instance, when we provide the label here:

<provider name="Keycloak">
      <!-- The URL should include the base keycloak path as well as the realm -->
      <url>https://keycloak.example.org/realms/master/</url>
      <client_id> ... </client_id>
      <client_secret> ... </client_secret>
      <redirect_uri>http://localhost:8080/authnz/keycloak/callback</redirect_uri>
      <!-- (Optional): a provider label to display in the UI -->
      <label>Fancy ORG with Keycload Auth</label>

We see it in the sign in or disconnect provider buttons:

use_keycloak_label_in_ui.mp4

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[davelopez]

Thank you @ahmedhamidawan!

[davelopez]

Hmm, since I realize this is a fix, maybe you can target 24.2?