feat: enable feature versioning for environments in newly created projects

[matthewelwell]

Changes

Enable feature versioning for environments in newly created projects (based on a flag).

How did you test this code?

TODO

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Feb 17, 2025 5:19pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Feb 17, 2025 5:19pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Feb 17, 2025 5:19pm

[github-actions]

Uffizzi Ephemeral Environment deployment-60945

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5108

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[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.43%. Comparing base (06e95fc) to head (dfc01de).

Files with missing lines	Patch %	Lines
api/environments/models.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5108      +/-   ##
==========================================
- Coverage   97.43%   97.43%   -0.01%     
==========================================
  Files        1214     1214              
  Lines       42327    42336       +9     
==========================================
+ Hits        41243    41251       +8     
- Misses       1084     1085       +1     

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