MWPW-188484: fix create variation on a new clone

[yesil]

This PR breaks initFragment method into multiple smaller methods and fixes an issue with variation creation from a fresh duplicate.

Resolves https://jira.corp.adobe.com/browse/MWPW-188484
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:

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• After: https://mwpw-188484--mas--adobecom.aem.live/

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Commits

• 608b1a9 ✅ (latest)
• fa6df7a ✅
• 064676d ✅
• b6af46e ✅
• 5b66ae8 ✅
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[codecov]

Codecov Report

❌ Patch coverage is 95.10490% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.68%. Comparing base (57bbb48) to head (681eaf9).

Files with missing lines	Patch %	Lines
studio/src/mas-fragment-editor.js	95.62%	6 Missing ⚠️
studio/src/mas-repository.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #616      +/-   ##
==========================================
+ Coverage   83.61%   83.68%   +0.06%     
==========================================
  Files         177      177              
  Lines       47795    47838      +43     
==========================================
+ Hits        39965    40032      +67     
+ Misses       7830     7806      -24     

Files with missing lines	Coverage Δ
studio/src/mas-variation-dialog.js	94.54% <100.00%> (ø)
studio/src/reactivity/source-fragment-store.js	77.33% <100.00%> (+0.46%)	⬆️
studio/src/mas-repository.js	53.72% <0.00%> (ø)
studio/src/mas-fragment-editor.js	88.40% <95.62%> (+1.84%)	⬆️

... and 4 files with indirect coverage changes

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