fix(sentry-FLAGSMITH-API-4FY): resolve metadata segment n+1

[gagantrivedi]

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Changes

fixes: https://flagsmith.sentry.io/issues/5385839623/
Fix segment metadata n+1 issue by prefetching metadata

How did you test this code?

Updated the unit test

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 3, 2024 6:32am
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.43%. Comparing base (50cc369) to head (14eeaa6).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4030      +/-   ##
==========================================
+ Coverage   96.41%   96.43%   +0.02%     
==========================================
  Files        1145     1149       +4     
  Lines       37295    37535     +240     
==========================================
+ Hits        35959    36198     +239     
- Misses       1336     1337       +1     

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[zachaysan]

Looks good, just missing typing on one test