replay: add sensitive content widget to default masking

[buenaflor]

📜 Description

Masks the SensitiveContent widget ootb for replay

TBD: check how we can add backwards compat

💡 Motivation and Context

Closes #2987

💚 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

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- add sensitive content widget to default masking ([#2989](https://github.com/getsentry/sentry-dart/pull/2989))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

Generated by 🚫 dangerJS against 74eb694

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.09%. Comparing base (c5616a6) to head (74eb694).
Report is 10 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (c5616a6) and HEAD (74eb694). Click for more details.

HEAD has 8 uploads less than BASE

Flag	BASE (c5616a6)	HEAD (74eb694)
	9	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2989       +/-   ##
===========================================
- Coverage   87.63%   63.09%   -24.54%     
===========================================
  Files         278        4      -274     
  Lines        9176      168     -9008     
===========================================
- Hits         8041      106     -7935     
+ Misses       1135       62     -1073     

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[ueman]

sentry-dart/dart/lib/src/event_processor/enricher/flutter_runtime.dart

Line 44 in 9e18a68

static const String? version = bool.hasEnvironment('FLUTTER_VERSION')

should be at least 3.33.0-0.2.pre or higher.

Ideally, you also make a check for bool.hasEnvironment('FLUTTER_VERSION') so that it tree shakes better. Calling a property on dynamic basically disables tree shaking for that property on any class. And the FLUTTER_VERSION dart define was introduced just one major Flutter version before this, which should already improve tree shaking quite a lot for most Flutter versions.