Remove unused dependancy Apache CXF

[cwperks]

Description

Since 2.12, the JWT implementation used in the SAML flow changed from Apache CXF to Nimbus. The PR where the change occurred is #3421

I'm opening a PR on main and 2.x to remove the remaining references to CXF and a separate PR on the 1.x line to update the dependencies which are still in use on that line.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Maintenance

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.28%. Comparing base (32bcf7b) to head (2710d89).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4580      +/-   ##
==========================================
+ Coverage   65.25%   65.28%   +0.03%     
==========================================
  Files         317      317              
  Lines       22272    22272              
  Branches     3582     3582              
==========================================
+ Hits        14534    14541       +7     
+ Misses       5946     5939       -7     
  Partials     1792     1792              

see 1 file with indirect coverage changes