fix(feature-export): handle unsuccessful feature export download exception

[matthewelwell]

Changes

Handle exception thrown when trying to download a feature export that is not yet complete.

Fixes sentry error https://flagsmith.sentry.io/issues/5800328361

How did you test this code?

Added specific test cases.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Feb 10, 2025 3:52pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Feb 10, 2025 3:52pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Feb 10, 2025 3:52pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5086	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-5086	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5086	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5086	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5086	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5086	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-60783

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5086

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.43%. Comparing base (3f7c9da) to head (ae57aaf).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5086   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files        1214     1214           
  Lines       42308    42318   +10     
=======================================
+ Hits        41224    41234   +10     
  Misses       1084     1084           

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