Wrong SCC credentials not marked as invalid

[mikeletux]

What does this PR change?

Port of https://github.com/SUSE/spacewalk/pull/22540

GUI diff

No difference.

• DONE

Documentation

PR in docs repo -> uyuni-project/uyuni-docs#2469

• DONE

Test coverage

• No tests: already covered
  Require testsuite change Wrong SCC credentials not marked as invalid #7593

• DONE

Links

Fixes https://github.com/SUSE/spacewalk/issues/21688

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

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Re-run a test

If you need to re-run a test, please mark the related checkbox, it will be unchecked automatically once it has re-run:

• Re-run test "changelog_test"
• Re-run test "backend_unittests_pgsql"
• Re-run test "java_pgsql_tests"
• Re-run test "schema_migration_test_pgsql"
• Re-run test "susemanager_unittests"
• Re-run test "javascript_lint"
• Re-run test "spacecmd_unittests"

[github-actions]

Suggested tests to cover this Pull Request

• srv_rename_hostname
• srv_monitoring
• srv_restart
• srv_first_settings
• proxy_branch_network
• srv_disable_local_repos_off