Add bulk group operations to workloads api tests

[dmjb]

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[github-actions]

Large PR Detected

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## Large PR Justification

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[github-actions]

✅ PR size has been reduced below the XL threshold. The size review has been dismissed and this PR can now proceed with normal review. Thank you for splitting this up!

PR size has been reduced below the XL threshold. Thank you for splitting this up!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.36%. Comparing base (78b00b5) to head (99bfbf9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3514      +/-   ##
==========================================
+ Coverage   65.30%   65.36%   +0.05%     
==========================================
  Files         403      403              
  Lines       39210    39210              
==========================================
+ Hits        25606    25629      +23     
+ Misses      11620    11593      -27     
- Partials     1984     1988       +4     

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