feat: sync environment to the native layers

[bitsandfoxes]

Closes #5385

The scope exposes Environment to be overwritten after initialization by the user. This needs to be propagated to the respective native layers. API available on

• sentry-native ✅
• sentry-cocoa ✅
• sentry-java needs to be followed up on.

We need to make sure that whatever it is that the SDK will end up setting on an event is also available on the native layer. The Enricher lazily guarantees that the context is getting populated, so clearing the Scope needs to restore the native scope to the fallback.

Initially, I thought we needed to have the Scope fetch and set the Environment from the options on the backing field in the constructor. The idea was that we'd avoid any duplicate scope sync. But this would only be an issue on non-global-mobe platforms, and those don't have scope sync in the first place.
So we can "get away" with simply having Environment be a smarter property.

Changelog Entry

The Environment set on the Scope now gets synchronized to the native layers (sentry-cocoa and sentry-native)

[codecov]

Codecov Report

❌ Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.23%. Comparing base (b302e47) to head (b7dd7fb).

Files with missing lines	Patch %	Lines
src/Sentry/Internal/ScopeObserver.cs	0.00%	4 Missing ⚠️
src/Sentry/Platforms/Native/NativeScopeObserver.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5365      +/-   ##
==========================================
- Coverage   74.25%   74.23%   -0.02%     
==========================================
  Files         509      509              
  Lines       18420    18435      +15     
  Branches     3606     3610       +4     
==========================================
+ Hits        13677    13685       +8     
- Misses       3869     3875       +6     
- Partials      874      875       +1     

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[jamescrosswell]

LGTM - thanks @bitsandfoxes !