Console login in external oidc env succeeds if the application client doesn't use PKCE (Proof Key for Code Exchange).

But console login in external oidc env fails if the application client uses PKCE (Proof Key for 
Code Exchange).

oc login works with PKCE application, doesn't have the issue.

4.20.0-0.nightly-2025-09-10-095237

Always

1. Create applications in the 3-rd party oidc provider. Enable PKCE on them.
2. Launch a HyperShift hosted cluster or OCP cluster with external oidc configuration, using above 3-rd party oidc provider and the applications.
3. Test oc login and console login

oc login works. But console login fails. After open the console URL, the browser address bar shows error, like `https://console-openshift-console.apps.<xxxx>/auth/error?error=PKCE+code+challenge+is+required+by+the+application.&error_type=auth` (Okta, see the screenshot https://drive.google.com/file/d/1qMsYA1RCFuGUUTTiw89D42YYOv3vSkPH/view?usp=drive_link ) or `https://console-openshift-console.apps.<xxxx>/auth/error?error=Missing+parameter%3A+code_challenge_method&error_type=auth` (Keycloak, see the screenshot https://drive.google.com/file/d/1t9I7P87P0eMtBkPE-Gcs-zVd6yDy3Dp9/view?usp=drive_link ).

And the browser page shows sth like:
                                        Authentication error
                       There was an authentication error. Please log out and try again.
If the problem persists, contact a cluster administrator, Red Hat Support or check our status page for known outages.
                                            Try again

Console login should succeed.