[repo/AWS.Sampler] Prepare to .NET9

[Kielek]

Changes

Follow up #2251

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

Attention: Patch coverage is 82.45614% with 10 lines in your changes missing coverage. Please review.

Project coverage is 73.00%. Comparing base (71655ce) to head (2756105).
Report is 561 commits behind head on main.

Files with missing lines	Patch %	Lines
.../OpenTelemetry.Sampler.AWS/AWSXRayRemoteSampler.cs	45.45%	6 Missing ⚠️
src/OpenTelemetry.Sampler.AWS/FallbackSampler.cs	0.00%	2 Missing ⚠️
src/OpenTelemetry.Sampler.AWS/SamplingRule.cs	0.00%	1 Missing ⚠️
src/OpenTelemetry.Sampler.AWS/SystemClock.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2266      +/-   ##
==========================================
- Coverage   73.91%   73.00%   -0.92%     
==========================================
  Files         267      359      +92     
  Lines        9615    13747    +4132     
==========================================
+ Hits         7107    10036    +2929     
- Misses       2508     3711    +1203     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	77.13% <ø> (?)
unittests-Exporter.Geneva	62.34% <ø> (?)
unittests-Exporter.InfluxDB	95.14% <ø> (?)
unittests-Exporter.Instana	74.86% <ø> (?)
unittests-Exporter.OneCollector	94.34% <ø> (?)
unittests-Exporter.Stackdriver	79.26% <ø> (?)
unittests-Extensions	88.63% <ø> (?)
unittests-Extensions.Enrichment	100.00% <ø> (?)
unittests-Instrumentation.AWS	85.95% <ø> (?)
unittests-Instrumentation.AspNet	76.73% <ø> (?)
unittests-Instrumentation.AspNetCore	70.06% <ø> (?)
unittests-Instrumentation.ConfluentKafka	14.12% <ø> (?)
unittests-Instrumentation.ElasticsearchClient	79.87% <ø> (?)
unittests-Instrumentation.EntityFrameworkCore	57.06% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (?)
unittests-Instrumentation.Hangfire	93.58% <ø> (?)
unittests-Instrumentation.Http	73.57% <ø> (?)
unittests-Instrumentation.Owin	85.97% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Quartz	78.94% <ø> (?)
unittests-Instrumentation.Runtime	97.53% <ø> (?)
unittests-Instrumentation.SqlClient	91.36% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	71.21% <ø> (?)
unittests-Instrumentation.Wcf	78.34% <ø> (?)
unittests-PersistentStorage	65.88% <ø> (?)
unittests-Resources.AWS	79.16% <ø> (?)
unittests-Resources.Azure	84.56% <ø> (?)
unittests-Resources.Container	67.34% <ø> (?)
unittests-Resources.Gcp	71.15% <ø> (?)
unittests-Resources.Host	73.91% <ø> (?)
unittests-Resources.OperatingSystem	76.98% <ø> (?)
unittests-Resources.Process	100.00% <ø> (?)
unittests-Resources.ProcessRuntime	78.26% <ø> (?)
unittests-Sampler.AWS	88.23% <82.45%> (?)

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

Files with missing lines	Coverage Δ
.../OpenTelemetry.Sampler.AWS/AWSXRaySamplerClient.cs	97.18% <100.00%> (+5.65%)	⬆️
src/OpenTelemetry.Sampler.AWS/Matcher.cs	97.82% <100.00%> (-0.10%)	⬇️
src/OpenTelemetry.Sampler.AWS/RateLimiter.cs	100.00% <100.00%> (ø)
src/OpenTelemetry.Sampler.AWS/RulesCache.cs	83.54% <100.00%> (+1.72%)	⬆️
...c/OpenTelemetry.Sampler.AWS/SamplingRuleApplier.cs	99.26% <100.00%> (+0.70%)	⬆️
src/OpenTelemetry.Sampler.AWS/SamplingRule.cs	90.47% <0.00%> (ø)
src/OpenTelemetry.Sampler.AWS/SystemClock.cs	63.63% <50.00%> (ø)
src/OpenTelemetry.Sampler.AWS/FallbackSampler.cs	66.66% <0.00%> (+11.11%)	⬆️
.../OpenTelemetry.Sampler.AWS/AWSXRayRemoteSampler.cs	53.42% <45.45%> (+2.70%)	⬆️

... and 369 files with indirect coverage changes

[CodeBlanch]

LGTM