chore: v2.4.0/v0.20.0 release proposal

[aabmass]

Release draft: https://github.com/GoogleCloudPlatform/opentelemetry-operations-js/releases/edit/untagged-6a8bb7790f9971e6b2bf

Following releasing instructions https://github.com/GoogleCloudPlatform/opentelemetry-operations-js/blob/main/docs/releasing.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (7f1ee19) to head (3a66210).
Report is 49 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #766   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files          18       18           
  Lines         703      704    +1     
  Branches      136      136           
=======================================
+ Hits          687      688    +1     
  Misses         16       16           

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