Add release note template

[dsimansk]

@rhuss I'd like to test the formatting etc. but need a populated PR list for that. :)

https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes#example-configurations

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.82%. Comparing base (b626b74) to head (ddfe8f6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1956   +/-   ##
=======================================
  Coverage   76.82%   76.82%           
=======================================
  Files         207      207           
  Lines       12892    12892           
=======================================
  Hits         9904     9904           
  Misses       2187     2187           
  Partials      801      801           

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[rhuss]

/approve
/lgtm

[knative-prow]

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