chore: update Polyfill from 1.32.0 to 9.7.7

[Flash0ver]

Update Polyfill from 1.32.0 to 9.7.7.

Related

• Disambiguate forwarded types when global using directives are used SimonCropp/Polyfill#454
• chore: upgrade to C# 14.0 #4857

Additional Changes

• remove now redundant Polyfill
• enable Polyfill-feature FeatureHttp for .NET Standard 2.0 and .NET Standard 2.1
• ensure Polyfill-feature FeatureMemory is not used when System.Memory is in an incompatible version

[Flash0ver]

Potential fixes for making the namespace Polyfills globally available for projects that reference src/Sentry.csproj and has it's internals made been visible to:

• add <ItemGroup><Using Include="Polyfills" /></ItemGroup> to each of these projects
• some MSBuild additions and restructuring
• via an repo-internal Source-Generator utilizing GivesAccessTo

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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• chore: update Polyfill from 1.32.0 to 9.7.7 by Flash0ver in #4879

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.88%. Comparing base (5df4eed) to head (d6718cc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4879      +/-   ##
==========================================
+ Coverage   73.87%   76.88%   +3.01%     
==========================================
  Files         494      405      -89     
  Lines       17868    15070    -2798     
  Branches     3509     3014     -495     
==========================================
- Hits        13200    11587    -1613     
+ Misses       3808     2769    -1039     
+ Partials      860      714     -146     

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