fix(versioning): ensure that future scheduled changes are migrated to versioning v2

[matthewelwell]

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• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

Ensure that future scheduled change requests are correctly migrated to feature versioning v2.

How did you test this code?

Added comprehensive unit test.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2024 2:09pm
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2024 2:09pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2024 2:09pm

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.01%. Comparing base (0ed5148) to head (28a772f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3958   +/-   ##
=======================================
  Coverage   96.01%   96.01%           
=======================================
  Files        1135     1135           
  Lines       36401    36435   +34     
=======================================
+ Hits        34950    34984   +34     
  Misses       1451     1451           

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[novakzaballa]

LGTM