Description of problem:

There are a couple of users who have reported this issue i.e.

* After upgrading to Red Hat Satellite 6.11, Some of the custom repositories are failing to get synced with the following error.

   ~~~
   Exception:
   PulpRpmClient::ApiError: Error message: the server returns an error
   HTTP status code: 400
   Response headers: {"Date"=>"Wed, 09 Nov 2022 15:07:29 GMT", "Server"=>"gunicorn", "Content-Type"=>"application/json", "Vary"=>"Accept,Cookie", "Allow"=>"GET, PUT, PATCH, DELETE, HEAD, OPTIONS", "X-Frame-Options"=>"DENY", "Content-Length"=>"89", "X-Content-Type-Options"=>"nosniff", "Referrer-Policy"=>"same-origin", "Correlation-ID"=>"ac17a33d-bea6-44e8-85b0-fd166cbd806d", "Access-Control-Expose-Headers"=>"Correlation-ID", "Via"=>"1.1 satellite.example.com", "Connection"=>"close"}
   Response body: {"username":["This field may not be blank."],"password":["This field may not be blank."]}
   ~~~

   
* Inspecting the repository from Satellite UI --> Content --> Products page, does not shows any username or password mentioned in the **Upstream Authorization** field as well.


Version-Release number of selected component (if applicable):

Satellite 6.11.4 and above


How reproducible:

By some customers who are using that satellite since 6.4 or 6.5 and have upgraded them to 6.11 


Steps to Reproduce:

NA


Actual results:

Sync fails with this error logged in production.log

   2022-11-09T08:48:33 [E|bac|075bdbe0] Error message: the server returns an error
    075bdbe0 | HTTP status code: 400
    075bdbe0 | Response headers: {"Date"=>"Wed, 09 Nov 2022 14:48:33 GMT", "Server"=>"gunicorn", "Content-Type"=>"application/json", "Vary"=>"Accept,Cookie", "Allow"=>"GET, 
PUT, PATCH, DELETE, HEAD, OPTIONS", "X-Frame-Options"=>"DENY", "Content-Length"=>"89", "X-Content-Type-Options"=>"nosniff", "Referrer-Policy"=>"same-origin", "Correlation
-ID"=>"075bdbe0-e38d-4c47-819f-27ca7182d620", "Access-Control-Expose-Headers"=>"Correlation-ID", "Via"=>"1.1 satellite.example.com", "Connection"=>"close"}
    075bdbe0 | Response body: {"username":["This field may not be blank."],"password":["This field may not be blank."]} (PulpRpmClient::ApiError)
    075bdbe0 | /opt/theforeman/tfm/root/usr/share/gems/gems/pulp_rpm_client-3.17.4/lib/pulp_rpm_client/api_client.rb:83:in `call_api'
    075bdbe0 | /opt/theforeman/tfm/root/usr/share/gems/gems/pulp_rpm_client-3.17.4/lib/pulp_rpm_client/api/remotes_rpm_api.rb:318:in `partial_update_with_http_info'
    075bdbe0 | /opt/theforeman/tfm/root/usr/share/gems/gems/pulp_rpm_client-3.17.4/lib/pulp_rpm_client/api/remotes_rpm_api.rb:262:in `partial_update'
    075bdbe0 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.3.0.50/app/services/katello/pulp3/repository.rb:150:in `remote_partial_update'
    075bdbe0 | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.3.0.50/app/services/katello/pulp3/repository.rb:138:in `update_remote'


And then, running this command against the concerned repo id fixes the issue:

# hammer repository update --id XXX --upstream-username='' --upstream-password=''



Expected results:

No such errors and no such manual actions should be needed. 



Additional info:

I believe a part of the improvement was done via BZ https://bugzilla.redhat.com/show_bug.cgi?id=2064793 | https://github.com/Katello/katello/pull/10018/files , due to which using "hammer repository update" we can fix the issue now but There should be some sort of migration script present that runs during upgrade, checks this inconsistency of values set for username\password between katello and pulpcore and fixes the same. 

As an end user, I should not need to run any additional commands to fix all my custom repos.