[MTV-1788] Failed to create OSP provider with authentication type - token and username

[jpuzz0]

📝 Links

https://issues.redhat.com/browse/MTV-1788

📝 Description

The incorrect Field ID was being used for the "Username" field, resulting in the wrong set of fields to validate (since these are conditionally set based on the "authentication type" radio selection).

The correct Field ID being used solved the problem, but to help prevent this from happening in the future, an enum was created as a source of truth for those Field IDs used across OpenStack provider create form sections.

We could also do this for other Provider forms that are not OpenStack, but this would be out of scope for this bug, and ideally done as a tech debt follow-up if wanted.

🎥 Demo

Before:
https://github.com/user-attachments/assets/2a6caac2-826f-4600-aa0a-a85731381563

After:
https://github.com/user-attachments/assets/709872d7-3a2a-4933-b55b-3299d65c6514

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
61.5% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.51%. Comparing base (13484d0) to head (9045dc7).
Report is 250 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1478      +/-   ##
==========================================
- Coverage   36.81%   36.51%   -0.31%     
==========================================
  Files         158      156       -2     
  Lines        2548     2528      -20     
  Branches      599      605       +6     
==========================================
- Hits          938      923      -15     
- Misses       1428     1600     +172     
+ Partials      182        5     -177     

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