UFAL/Shibboleth login - new error page when the email already exist?

[milanmajchrak]

Not a specific error, because it indicates to the user that someone with this email is signed into DSpace. Potential security issue.

Just show an error page indicating that login was unsuccessful.

[milanmajchrak]

During this issue some Vanilla tests have started failing.

I asked a question in the Slack:

Hi all, some unit tests in the GitHub action have suddenly started failing. This has happened in the past as well (see: https://dspace-org.slack.com/archives/C3N0VHT6K/p1725885382827249), but now different tests are failing.
Error log:
Error:  Failures: 
Error:  org.dspace.external.CachingOrcidRestConnectorTest.getLabel(org.dspace.external.CachingOrcidRestConnectorTest)
Error:    Run 1: CachingOrcidRestConnectorTest.getLabel:69 expected:<Connor, John> but was:<null>
Error:    Run 2: CachingOrcidRestConnectorTest.getLabel:69 expected:<Connor, John> but was:<null>
Error:    Run 3: CachingOrcidRestConnectorTest.getLabel:69 expected:<Connor, John> but was:<null>
[INFO] 
Error:  org.dspace.external.CachingOrcidRestConnectorTest.search(org.dspace.external.CachingOrcidRestConnectorTest)
Error:    Run 1: CachingOrcidRestConnectorTest.search:80
Error:    Run 2: CachingOrcidRestConnectorTest.search:80
Error:    Run 3: CachingOrcidRestConnectorTest.search:80
[INFO] 
Error:  org.dspace.external.CachingOrcidRestConnectorTest.testCachable(org.dspace.external.CachingOrcidRestConnectorTest)
Error:    Run 1: CachingOrcidRestConnectorTest.testCachable:123 expected:<Connor, John> but was:<null>
Error:    Run 2: CachingOrcidRestConnectorTest.testCachable:123 expected:<Connor, John> but was:<null>
Error:    Run 3: CachingOrcidRestConnectorTest.testCachable:123 expected:<Connor, John> but was:<null>
[INFO] 
Error:  org.dspace.external.CachingOrcidRestConnectorTest.testCacheableWithError(org.dspace.external.CachingOrcidRestConnectorTest)
Error:    Run 1: CachingOrcidRestConnectorTest.testCacheableWithError:153 expected:<Connor, John> but was:<null>
Error:    Run 2: CachingOrcidRestConnectorTest.testCacheableWithError:153 expected:<Connor, John> but was:<null>
Error:    Run 3: CachingOrcidRestConnectorTest.testCacheableWithError:153 expected:<Connor, John> but was:<null>
[INFO] 
[INFO] 
Error:  Tests run: 1199, Failures: 4, Errors: 0, Skipped: 10
I noticed this issue yesterday. It is also happening in more branches, even in those where all checks had previously passed.
Has anyone else noticed this and, hopefully, already found a solution?

Thank you!

[milanmajchrak]

e2732a7