[Infra] 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

❌ Patch coverage is 72.88136% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.55%. Comparing base (4843598) to head (553c164).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...rter.Geneva/Internal/Tld/UncheckedASCIIEncoding.cs	6.66%	14 Missing ⚠️
src/OpenTelemetry.Resources.Host/HostDetector.cs	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3867      +/-   ##
==========================================
- Coverage   77.84%   77.55%   -0.30%     
==========================================
  Files         473      473              
  Lines       20205    20235      +30     
==========================================
- Hits        15729    15693      -36     
- Misses       4476     4542      +66     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	89.92% <ø> (ø)
unittests-Exporter.Geneva	56.46% <30.00%> (+0.06%)	⬆️
unittests-Exporter.InfluxDB	97.96% <ø> (ø)
unittests-Exporter.OneCollector	95.60% <100.00%> (ø)
unittests-Extensions	96.17% <ø> (+0.42%)	⬆️
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	85.42% <100.00%> (+0.06%)	⬆️
unittests-Instrumentation.AspNet	79.01% <ø> (ø)
unittests-Instrumentation.AspNetCore	87.46% <100.00%> (+0.26%)	⬆️
unittests-Instrumentation.Cassandra	92.30% <ø> (ø)
unittests-Instrumentation.ConfluentKafka	83.42% <100.00%> (-0.12%)	⬇️
unittests-Instrumentation.ElasticsearchClient	80.60% <100.00%> (+0.23%)	⬆️
unittests-Instrumentation.EntityFrameworkCore	81.02% <ø> (ø)
unittests-Instrumentation.EventCounters	75.45% <ø> (ø)
unittests-Instrumentation.GrpcCore	91.12% <ø> (ø)
unittests-Instrumentation.GrpcNetClient	78.09% <ø> (ø)
unittests-Instrumentation.Hangfire	88.88% <ø> (ø)
unittests-Instrumentation.Http	73.27% <100.00%> (-2.34%)	⬇️
unittests-Instrumentation.Kusto	91.66% <ø> (-0.76%)	⬇️
unittests-Instrumentation.Owin	89.02% <ø> (ø)
unittests-Instrumentation.Process	100.00% <ø> (ø)
unittests-Instrumentation.Quartz	77.77% <ø> (ø)
unittests-Instrumentation.Remoting	65.59% <ø> (ø)
unittests-Instrumentation.Runtime	79.87% <ø> (-20.13%)	⬇️
unittests-Instrumentation.ServiceFabricRemoting	39.91% <ø> (ø)
unittests-Instrumentation.SqlClient	83.71% <100.00%> (+0.34%)	⬆️
unittests-Instrumentation.StackExchangeRedis	94.98% <ø> (ø)
unittests-Instrumentation.Wcf	82.52% <ø> (-0.13%)	⬇️
unittests-OpAmp.Client	86.24% <100.00%> (-0.99%)	⬇️
unittests-PersistentStorage	71.09% <100.00%> (+0.42%)	⬆️
unittests-PowerShellScripts	86.27% <ø> (ø)
unittests-Resources.AWS	72.88% <100.00%> (+0.09%)	⬆️
unittests-Resources.Azure	84.18% <ø> (ø)
unittests-Resources.Container	81.81% <100.00%> (+1.04%)	⬆️
unittests-Resources.Gcp	80.70% <ø> (ø)
unittests-Resources.Host	71.23% <60.00%> (-1.11%)	⬇️
unittests-Resources.OperatingSystem	77.16% <ø> (ø)
unittests-Resources.Process	90.90% <ø> (ø)
unittests-Resources.ProcessRuntime	80.76% <ø> (ø)
unittests-Sampler.AWS	96.05% <100.00%> (-0.18%)	⬇️

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%)	⬆️
...rter.Geneva/Internal/MsgPack/MsgPackLogExporter.cs	92.52% <100.00%> (ø)
...metry.Exporter.Geneva/Internal/Tld/TldLogCommon.cs	66.91% <100.00%> (+0.25%)	⬆️
...er.OneCollector/Internal/ConnectionStringParser.cs	100.00% <100.00%> (ø)
...Exporter.OneCollector/Internal/EventNameManager.cs	100.00% <100.00%> (ø)
...erialization/CommonSchemaJsonSerializationState.cs	97.72% <100.00%> (ø)
...y.Extensions/Trace/ConsistentProbabilitySampler.cs	100.00% <ø> (ø)
...on.AWS/Implementation/AWSTracingPipelineHandler.cs	93.52% <100.00%> (+0.04%)	⬆️
...tion.AWS/Implementation/SnsRequestContextHelper.cs	92.30% <100.00%> (ø)
...tion.AWS/Implementation/SqsRequestContextHelper.cs	92.30% <100.00%> (ø)
... and 18 more

... and 12 files with indirect coverage changes

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