Remove renderer from flutter_context

[denrase]

📜 Description

Remove renderer from flutter_context

💡 Motivation and Context

Closes #2712

💚 How did you test it?

CI

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.72%. Comparing base (b06e562) to head (cd489a7).
Report is 1 commits behind head on v9.

Additional details and impacted files

@@            Coverage Diff             @@
##               v9    #2751      +/-   ##
==========================================
+ Coverage   88.45%   89.72%   +1.27%     
==========================================
  Files         262       91     -171     
  Lines        8750     2950    -5800     
==========================================
- Hits         7740     2647    -5093     
+ Misses       1010      303     -707     

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[krystofwoldrich]

LGTM 🚀