MWPW-192308-test: Add ability to create a grouped variation of a collections

[Andrei4226]

Resolves https://jira.corp.adobe.com/browse/MWPW-192308
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Please do the steps below before submitting your PR for a code review or QA

• C1. Cover code with Unit Tests
• C2. Add a Nala test (double check with #fishbags if nala test is needed)
• C3. Verify all Checks are green (unit tests, nala tests)
• C4. PR description contains working Test Page link where the feature can be tested
• C5: you are ready to do a demo from Test Page in PR (bonus: write a working demo script that you'll use on Thursday, you can eventually put in your PR)
• C.6 read your Jira one more time to validate that you've addressed all AC's and nothing is missing

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Test URLs:

• Before: https://main--mas--adobecom.aem.live/
• After: https://mwpw-192308-test--mas--adobecom.aem.live/

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[codecov]

Codecov Report

❌ Patch coverage is 55.17241% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.48%. Comparing base (5d49c47) to head (d9feed9).

Files with missing lines	Patch %	Lines
studio/src/mas-repository.js	47.05%	9 Missing ⚠️
studio/src/mas-variation-dialog.js	66.66%	4 Missing ⚠️

❌ Your patch check has failed because the patch coverage (55.17%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #818      +/-   ##
==========================================
+ Coverage   87.45%   87.48%   +0.02%     
==========================================
  Files         214      214              
  Lines       63827    63855      +28     
==========================================
+ Hits        55821    55861      +40     
+ Misses       8006     7994      -12     

Files with missing lines	Coverage Δ
studio/src/mas-variation-dialog.js	93.54% <66.66%> (-1.00%)	⬇️
studio/src/mas-repository.js	66.23% <47.05%> (-0.14%)	⬇️

... and 2 files with indirect coverage changes

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