[v9] Remove old user feedback api

[buenaflor]

📜 Description

💡 Motivation and Context

Closes #2682

💚 How did you test it?

📝 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 88.37%. Comparing base (ea071ab) to head (619c6a2).
Report is 1 commits behind head on v9.

Additional details and impacted files

@@            Coverage Diff             @@
##               v9    #2686      +/-   ##
==========================================
+ Coverage   88.24%   88.37%   +0.12%     
==========================================
  Files         263      262       -1     
  Lines        8918     8862      -56     
==========================================
- Hits         7870     7832      -38     
+ Misses       1048     1030      -18     

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[buenaflor]

@denrase I updated the hive mocks with the build_runner but now the hive tests are failing because something's wrong with the generated mocks, have you encountered this as well?

[denrase]

@buenaflor Yup, had the same issue yesterday, just check my commits here: https://github.com/getsentry/sentry-dart/pull/2675/commits

[buenaflor]

@denrase how did you fix it? re-generating the mock doesn't seem to work in my case

[denrase]

@buenaflor Added the compiler directives back in that were deleted (see diff or commits) and also in hive mocks, there is some custom code which i added back in after re-generation overrode it.

60a3c2a

[denrase]

@buenaflor Analyze is failing, probably just some warning left somewhere.