Trigger pack and publish when release is created

[alanwest]

I think I like this approach better than #3634.

The pack and publish job is kicked off automatically upon creating a release in GitHub.

Step 1 - Create and push the tags just as before. Then click create release here:

Step 2 - Fill out the details of the release as usual:

Step 3 - Click "Publish release" and the job is kicked off like so:

[codecov]

Codecov Report

Merging #3638 (7fa0c94) into main (d10f1f9) will decrease coverage by 0.22%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3638      +/-   ##
==========================================
- Coverage   87.80%   87.58%   -0.23%     
==========================================
  Files         283      283              
  Lines       10308    10308              
==========================================
- Hits         9051     9028      -23     
- Misses       1257     1280      +23     

Impacted Files	Coverage Δ
...entation/ExportClient/OtlpGrpcTraceExportClient.cs	35.71% <0.00%> (-42.86%)	⬇️
...xporter.OpenTelemetryProtocol/OtlpTraceExporter.cs	36.36% <0.00%> (-40.91%)	⬇️
...tation/OpenTelemetryProtocolExporterEventSource.cs	75.00% <0.00%> (-10.00%)	⬇️
...ZPages/Implementation/ZPagesExporterEventSource.cs	56.25% <0.00%> (-6.25%)	⬇️
...metryProtocol/Implementation/ActivityExtensions.cs	91.75% <0.00%> (-3.30%)	⬇️
...ter.ZPages/Implementation/ZPagesActivityTracker.cs	97.14% <0.00%> (-2.86%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	79.41% <0.00%> (+2.94%)	⬆️
...Propagators/OpenTelemetryPropagatorsEventSource.cs	100.00% <0.00%> (+12.50%)	⬆️

[TimothyMothra]

This looks like the better option to me.
Triggering the release from the Tag seems straight forward and less error prone.

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[github-actions]

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