Support .NET 11

[martincostello]

The intention is to keep this PR updated over the course of .NET 11's development as new previews are released.

Fixes #1730.

Changes

Add support for building and testing with .NET 11.

• Build with .NET 11 SDK
• Add net11.0 target
• Drop net8.0 and net9.0 targets

TODO

• Use stable (or RC) SDK, container and NuGet package versions
• Re-enable disabled tests
• Remove any hacks or TODOs

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 75.48%. Comparing base (435cf5f) to head (32e202d).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3867      +/-   ##
==========================================
- Coverage   75.76%   75.48%   -0.28%     
==========================================
  Files         438      438              
  Lines       18002    18035      +33     
==========================================
- Hits        13639    13614      -25     
- Misses       4363     4421      +58     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	89.79% <ø> (ø)
unittests-Exporter.Geneva	54.61% <100.00%> (-0.11%)	⬇️
unittests-Exporter.InfluxDB	95.75% <ø> (ø)
unittests-Exporter.OneCollector	94.67% <ø> (ø)
unittests-Extensions	90.61% <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	85.18% <100.00%> (+0.09%)	⬆️
unittests-Instrumentation.AspNet	77.50% <ø> (ø)
unittests-Instrumentation.AspNetCore	87.82% <100.00%> (+0.47%)	⬆️
unittests-Instrumentation.Cassandra	92.68% <ø> (ø)
unittests-Instrumentation.ConfluentKafka	82.04% <ø> (ø)
unittests-Instrumentation.ElasticsearchClient	80.60% <100.00%> (+0.23%)	⬆️
unittests-Instrumentation.EntityFrameworkCore	81.02% <ø> (ø)
unittests-Instrumentation.EventCounters	77.47% <ø> (ø)
unittests-Instrumentation.GrpcCore	91.18% <ø> (ø)
unittests-Instrumentation.GrpcNetClient	78.50% <ø> (ø)
unittests-Instrumentation.Hangfire	88.83% <ø> (ø)
unittests-Instrumentation.Http	72.29% <ø> (-2.52%)	⬇️
unittests-Instrumentation.Owin	88.88% <ø> (ø)
unittests-Instrumentation.Process	100.00% <ø> (ø)
unittests-Instrumentation.Quartz	78.37% <ø> (ø)
unittests-Instrumentation.Remoting	65.59% <ø> (ø)
unittests-Instrumentation.Runtime	80.24% <ø> (-19.76%)	⬇️
unittests-Instrumentation.ServiceFabricRemoting	39.91% <ø> (ø)
unittests-Instrumentation.SqlClient	82.90% <ø> (+0.21%)	⬆️
unittests-Instrumentation.StackExchangeRedis	94.02% <ø> (ø)
unittests-Instrumentation.Wcf	82.23% <ø> (ø)
unittests-OpAmp.Client	84.97% <ø> (-0.50%)	⬇️
unittests-PersistentStorage	69.65% <100.00%> (+1.91%)	⬆️
unittests-Resources.AWS	73.70% <100.00%> (+0.09%)	⬆️
unittests-Resources.Azure	87.67% <ø> (ø)
unittests-Resources.Container	69.23% <100.00%> (+1.88%)	⬆️
unittests-Resources.Gcp	71.42% <ø> (ø)
unittests-Resources.Host	71.53% <ø> (-0.73%)	⬇️
unittests-Resources.OperatingSystem	76.98% <ø> (ø)
unittests-Resources.Process	90.47% <ø> (ø)
unittests-Resources.ProcessRuntime	79.59% <ø> (ø)
unittests-Sampler.AWS	95.98% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
...xporter.Geneva/Internal/ConnectionStringBuilder.cs	95.95% <100.00%> (+0.04%)	⬆️
...erialization/CommonSchemaJsonSerializationState.cs	97.72% <ø> (ø)
...on.AWS/Implementation/AWSTracingPipelineHandler.cs	93.65% <100.00%> (+0.15%)	⬆️
...tion.AWSLambda/Implementation/AWSMessagingUtils.cs	75.47% <100.00%> (+2.00%)	⬆️
...nstrumentation.AspNetCore/HttpContextExtensions.cs	100.00% <ø> (ø)
...tation.AspNetCore/Implementation/HttpInListener.cs	87.95% <100.00%> (+0.87%)	⬆️
.../ElasticsearchRequestPipelineDiagnosticListener.cs	84.49% <100.00%> (+0.24%)	⬆️
...mentation/RedisProfilerEntryToActivityConverter.cs	93.00% <ø> (ø)
...metry.OpAmp.Client/Settings/OpAmpClientSettings.cs	90.90% <ø> (ø)
...Telemetry.PersistentStorage.FileSystem/FileBlob.cs	92.15% <100.00%> (+0.15%)	⬆️
... and 4 more

... and 10 files with indirect coverage changes

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