Support .NET 10

[martincostello]

Changes

Add support for building and testing with .NET 10 using .NET 10 RC2.

Also resolves #2459 as the .NET 10 SDK has new features that allows System.Text.Json to be detected as a shipping part of the parent application so we can remove the reference and allow the application to bring its own version with it.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.73%. Comparing base (e666d6a) to head (3bdb09d).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2822      +/-   ##
==========================================
- Coverage   70.82%   70.73%   -0.09%     
==========================================
  Files         440      440              
  Lines       17261    17262       +1     
==========================================
- Hits        12225    12211      -14     
- Misses       5036     5051      +15     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	86.54% <ø> (ø)
unittests-Exporter.Geneva	53.64% <ø> (-0.33%)	⬇️
unittests-Exporter.InfluxDB	95.14% <ø> (ø)
unittests-Exporter.Instana	74.86% <ø> (ø)
unittests-Exporter.OneCollector	94.61% <ø> (ø)
unittests-Extensions	90.65% <ø> (ø)
unittests-Extensions.Enrichment	100.00% <ø> (ø)
unittests-Extensions.Enrichment.AspNetCore	86.27% <ø> (ø)
unittests-Extensions.Enrichment.Http	94.33% <ø> (ø)
unittests-Instrumentation.AWS	83.80% <ø> (ø)
unittests-Instrumentation.AspNet	77.92% <ø> (-0.23%)	⬇️
unittests-Instrumentation.AspNetCore	71.69% <ø> (+0.92%)	⬆️
unittests-Instrumentation.Cassandra	23.52% <ø> (ø)
unittests-Instrumentation.ConfluentKafka	14.10% <ø> (ø)
unittests-Instrumentation.ElasticsearchClient	80.12% <ø> (ø)
unittests-Instrumentation.EntityFrameworkCore	80.80% <ø> (ø)
unittests-Instrumentation.EventCounters	77.27% <ø> (ø)
unittests-Instrumentation.GrpcCore	91.42% <ø> (ø)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (ø)
unittests-Instrumentation.Hangfire	84.61% <ø> (ø)
unittests-Instrumentation.Http	74.22% <100.00%> (+0.03%)	⬆️
unittests-Instrumentation.Owin	88.62% <ø> (ø)
unittests-Instrumentation.Process	100.00% <ø> (ø)
unittests-Instrumentation.Quartz	78.76% <ø> (ø)
unittests-Instrumentation.Runtime	100.00% <ø> (ø)
unittests-Instrumentation.ServiceFabricRemoting	34.54% <ø> (ø)
unittests-Instrumentation.SqlClient	87.29% <ø> (ø)
unittests-Instrumentation.StackExchangeRedis	71.80% <ø> (ø)
unittests-Instrumentation.Wcf	79.68% <ø> (ø)
unittests-OpAmp.Client	71.55% <ø> (ø)
unittests-PersistentStorage	74.91% <ø> (ø)
unittests-Resources.AWS	74.42% <ø> (ø)
unittests-Resources.Azure	85.31% <ø> (ø)
unittests-Resources.Container	67.34% <ø> (ø)
unittests-Resources.Gcp	71.42% <ø> (ø)
unittests-Resources.Host	71.85% <ø> (ø)
unittests-Resources.OperatingSystem	76.98% <ø> (ø)
unittests-Resources.Process	100.00% <ø> (ø)
unittests-Resources.ProcessRuntime	79.59% <ø> (ø)
unittests-Sampler.AWS	93.23% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...tp/Implementation/HttpHandlerDiagnosticListener.cs	73.17% <100.00%> (+0.21%)	⬆️

... and 3 files with indirect coverage changes

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[martincostello]

Need to investigate macOS test failure with .NET 10. I don't have a Macbook so might be tricky:

[xUnit.net 00:00:00.10]   Finished:    OpenTelemetry.Resources.OperatingSystem.Tests
  Failed OpenTelemetry.Resources.OperatingSystem.Test.OperatingSystemDetectorTests.TestOperatingSystemAttributes [7 ms]
  Error Message:
Test Run Failed.
   Assert.Contains() Failure: Sub-string not found
String:    "macOS 14.7.6"
Not found: "Darwin"
  Stack Trace:
     at OpenTelemetry.Resources.OperatingSystem.Test.OperatingSystemDetectorTests.TestOperatingSystemAttributes() in /Users/runner/work/opentelemetry-dotnet-contrib/opentelemetry-dotnet-contrib/test/OpenTelemetry.Resources.OperatingSystem.Tests/OperatingSystemDetectorTests.cs:line 49
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

[martincostello]

Need to investigate macOS test failure with .NET 10

Due to changes in dotnet/runtime#113041.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.