ci(tests/private-packages): Add SAML, auth controller and workflow

[gagantrivedi]

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Changes

Add SAML, workflow and auth controller to private package test workflow

How did you test this code?

The workflow ran successfully here: https://github.com/Flagsmith/flagsmith/actions/runs/9533292963/job/26276374433?pr=4140

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3 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.60%. Comparing base (5c25c41) to head (847173d).
Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4140      +/-   ##
==========================================
+ Coverage   96.57%   96.60%   +0.03%     
==========================================
  Files        1190     1195       +5     
  Lines       38747    39099     +352     
==========================================
+ Hits        37419    37773     +354     
+ Misses       1328     1326       -2     

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