feat(feedback): Enrich user feedback with scope data

[limbonaut]

Previously, user feedback was sent as a bare event payload carrying no scope data, so it had no trace tying it to errors from the same session, no release, environment, etc, which left Sentry defaulting the environment to production and mislabeling feedback coming from other builds. This PR applies the global scope to the feedback event before it is enveloped, so release, environment, tags, user, and contexts including the trace all come along. Breadcrumbs, modules, stacktraces, and scope attachments are deliberately left off.

• Closes Apply relevant scope data to user feedback #1886
• Before this PR: feedback item
• After this PR: feedback item

It also fixes a pre-existing leak where capturing feedback before the SDK is initialized dropped the feedback value without releasing it.

Scope attachments are excluded from this change. The spec requires scope data, such as tags, user, trace, and contexts, to be included with feedback, but only says attachments MAY be sent. The spec doesn't explicitly forbid scope attachments either. Java/Android doesn't include scope attachments, but .NET and Cocoa do. So it seems that existing implementations drifted on this. Per-feedback attachments remain available via sentry_capture_feedback_with_hint.

[github-actions]

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📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

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[codecov]

Codecov Report

❌ Patch coverage is 89.18919% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.64%. Comparing base (b5cd30f) to head (1073ed7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1915      +/-   ##
==========================================
- Coverage   75.71%   75.64%   -0.07%     
==========================================
  Files          93       93              
  Lines       22034    22052      +18     
  Branches     3925     3928       +3     
==========================================
- Hits        16682    16681       -1     
- Misses       4464     4488      +24     
+ Partials      888      883       -5     

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[limbonaut]

One decision point is whether to include scope attachments in user feedback. Currently, scope attachments are excluded from this change. The spec requires scope data, such as tags, user, trace, and contexts, to be included with feedback, but only says attachments MAY be sent. The spec doesn't explicitly forbid scope attachments either. Java/Android doesn't include scope attachments, but .NET and Cocoa do. So it seems that existing implementations drifted on this. Per-feedback attachments remain available via sentry_capture_feedback_with_hint.