More UI tests

[mirekdlugosz]

These two commits add some new UI tests that were hard to implement while we still needed to think about supporting old UI:

• a test for creating OpenShift credential using username and password
• a test to download report through kebab menu item (technically kebab becomes the default way of downloading reports, and new test covers downloading through modal)

This depends on ouia IDs added in quipucords/quipucords-ui#531

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.15%. Comparing base (0cb990a) to head (dc22f5f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #557   +/-   ##
=======================================
  Coverage   77.15%   77.15%           
=======================================
  Files           7        7           
  Lines         709      709           
=======================================
  Hits          547      547           
  Misses        162      162           

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