[repo] Core version update improvements

[CodeBlanch]

Changes

• Adds support for updating OpenTelemetryCoreUnstableLatestVersion (introduced in [repo] Separate pkg version for core-unstable packages #1870) when a coreunstable- tag is released from main repo.
• Switches to \n instead of \r\n for line-endings to make sanity check happy and reduce changes shown on CHANGELOG diffs.

Details

Test runs:

• [release] coreunstable-1.9.0-alpha.3 release updates CodeBlanchOrg/opentelemetry-dotnet-contrib#20
• [release] core-1.9.0 release updates CodeBlanchOrg/opentelemetry-dotnet-contrib#21
• [release] core-1.9.0-rc.2 release updates CodeBlanchOrg/opentelemetry-dotnet-contrib#22

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.60%. Comparing base (71655ce) to head (66fce54).
Report is 303 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1882      +/-   ##
==========================================
- Coverage   73.91%   73.60%   -0.32%     
==========================================
  Files         267      278      +11     
  Lines        9615    10523     +908     
==========================================
+ Hits         7107     7745     +638     
- Misses       2508     2778     +270     

Flag	Coverage Δ
unittests-Exporter.Geneva	64.81% <ø> (?)
unittests-Exporter.InfluxDB	95.88% <ø> (?)
unittests-Exporter.Instana	68.22% <ø> (?)
unittests-Exporter.OneCollector	91.29% <ø> (?)
unittests-Exporter.Stackdriver	75.73% <ø> (?)
unittests-Extensions	79.33% <ø> (?)
unittests-Extensions.AWS	83.41% <ø> (?)
unittests-Extensions.Enrichment	100.00% <ø> (?)
unittests-Instrumentation.AWS	80.59% <ø> (?)
unittests-Instrumentation.AWSLambda	87.96% <ø> (?)
unittests-Instrumentation.AspNet	74.85% <ø> (?)
unittests-Instrumentation.AspNetCore	85.27% <ø> (?)
unittests-Instrumentation.ElasticsearchClient	79.87% <ø> (?)
unittests-Instrumentation.EntityFrameworkCore	55.49% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (?)
unittests-Instrumentation.Hangfire	93.58% <ø> (?)
unittests-Instrumentation.Http	81.08% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Quartz	78.94% <ø> (?)
unittests-Instrumentation.Runtime	100.00% <ø> (?)
unittests-Instrumentation.SqlClient	90.90% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	68.02% <ø> (?)
unittests-Instrumentation.Wcf	48.91% <ø> (?)
unittests-PersistentStorage	65.44% <ø> (?)
unittests-Resources.AWS	74.53% <ø> (?)
unittests-Resources.Azure	78.35% <ø> (?)
unittests-Resources.Container	72.41% <ø> (?)
unittests-Resources.Gcp	72.54% <ø> (?)
unittests-Resources.Host	47.67% <ø> (?)
unittests-Resources.Process	81.81% <ø> (?)
unittests-Resources.ProcessRuntime	82.35% <ø> (?)

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

see 303 files with indirect coverage changes