[AOT] suppressed trimming warnings in AspNetCore and GrpcNetClient Instrumentation packages

[Yun-Ting]

Towards #3429

cc: @vitek-karas @eerhardt

Changes

Suppressed trimming warnings IL2026 in AspNetCore and GrpcNetClient Instrumentation packages because the AOT-annotation DynamicallyAccessedMembers
https://learn.microsoft.com/dotnet/api/system.diagnostics.codeanalysis.dynamicallyaccessedmembersattribute?view=net-7.0
ensures that top-level properties on the payload object are always preserved.

For OpenTelemetry.Instrumentation.AspNetCore, see https://github.com/dotnet/aspnetcore/blob/690d78279e940d267669f825aa6627b0d731f64c/src/Hosting/Hosting/src/Internal/HostingApplicationDiagnostics.cs#L252
, and https://github.com/dotnet/aspnetcore/blob/690d78279e940d267669f825aa6627b0d731f64c/src/Middleware/Diagnostics/src/DeveloperExceptionPage/DeveloperExceptionPageMiddlewareImpl.cs#L174

For OpenTelemetry.GrpcNetClient.Instrumentation, see
https://github.com/grpc/grpc-dotnet/blob/ff1a07b90c498f259e6d9f4a50cdad7c89ecd3c0/src/Grpc.Net.Client/Internal/GrpcCall.cs#L1180-L1183

Merge requirement checklist

• CONTRIBUTING guidelines followed (nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Merging #4795 (954a7b7) into main (73df32b) will increase coverage by 0.04%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4795      +/-   ##
==========================================
+ Coverage   85.57%   85.62%   +0.04%     
==========================================
  Files         284      284              
  Lines       11683    11686       +3     
==========================================
+ Hits         9998    10006       +8     
+ Misses       1685     1680       -5     

Files Changed	Coverage Δ
...tation.AspNetCore/Implementation/HttpInListener.cs	91.66% <100.00%> (+0.04%)	⬆️
...ent/Implementation/GrpcClientDiagnosticListener.cs	88.57% <100.00%> (+0.33%)	⬆️

... and 3 files with indirect coverage changes

[eerhardt]

LGTM

[vitek-karas]

because the AOT-annotation DynamicallyAccessedMembers
https://learn.microsoft.com/dotnet/api/system.diagnostics.codeanalysis.dynamicallyaccessedmembersattribute?view=net-7.0
in Systm.Net.Http library ensures that top-level properties on the payload object are always preserved.

This is part of the PR description - and it's incorrect - it's probably a copy/paste from the previous PR which did this for System.Net.Http.

[vitek-karas]

Thanks!

[reyang]

Looks good to me with a non-blocking naming question.