[Resources.AWS] Execute tests against .NET9

[Kielek]

Fixes #2323
Design discussion issue #

Changes

[Resources.AWS] Execute tests against .NET9
Drops unused SupportedNetTargetsWithoutNet9

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 68.42%. Comparing base (71655ce) to head (b47a38c).
Report is 600 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2328      +/-   ##
==========================================
- Coverage   73.91%   68.42%   -5.49%     
==========================================
  Files         267      364      +97     
  Lines        9615    13896    +4281     
==========================================
+ Hits         7107     9509    +2402     
- Misses       2508     4387    +1879     

Flag	Coverage Δ
unittests-Contrib.Shared.Tests	77.13% <ø> (?)
unittests-Exporter.Geneva	47.70% <ø> (?)
unittests-Exporter.InfluxDB	95.14% <ø> (?)
unittests-Exporter.Instana	74.86% <ø> (?)
unittests-Exporter.OneCollector	94.51% <ø> (?)
unittests-Exporter.Stackdriver	79.26% <ø> (?)
unittests-Extensions	88.63% <ø> (?)
unittests-Extensions.Enrichment	100.00% <ø> (?)
unittests-Instrumentation.AWS	86.38% <ø> (?)
unittests-Instrumentation.AspNet	77.00% <ø> (?)
unittests-Instrumentation.AspNetCore	70.33% <ø> (?)
unittests-Instrumentation.ConfluentKafka	14.51% <ø> (?)
unittests-Instrumentation.ElasticsearchClient	80.12% <ø> (?)
unittests-Instrumentation.EntityFrameworkCore	57.06% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.GrpcCore	91.42% <ø> (?)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (?)
unittests-Instrumentation.Hangfire	93.58% <ø> (?)
unittests-Instrumentation.Http	74.11% <ø> (?)
unittests-Instrumentation.Owin	88.12% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Quartz	78.76% <ø> (?)
unittests-Instrumentation.Runtime	98.02% <ø> (?)
unittests-Instrumentation.SqlClient	91.69% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	68.26% <ø> (?)
unittests-Instrumentation.Wcf	49.37% <ø> (?)
unittests-PersistentStorage	64.54% <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	88.10% <ø> (?)

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see 385 files with indirect coverage changes

[Kielek]

@xiang17, FYI