fix: Extend user first name length to 150 characters

[khvn26]

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Changes

Closes #4796.

How did you test this code?

No testing required.

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4797	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4797	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4797	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4797	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4797	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4797	Finished ✅	Results ✅

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Nov 4, 2024 5:12pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Nov 4, 2024 5:12pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Nov 4, 2024 5:12pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.33%. Comparing base (43e68c1) to head (3992c21).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4797   +/-   ##
=======================================
  Coverage   97.33%   97.33%           
=======================================
  Files        1179     1180    +1     
  Lines       41209    41213    +4     
=======================================
+ Hits        40109    40113    +4     
  Misses       1100     1100           

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