Add PR template picker in the default PR template

[aobolensk]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.78%. Comparing base (eaa10b0) to head (0ea0a25).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #441   +/-   ##
=======================================
  Coverage   95.78%   95.78%           
=======================================
  Files          16       16           
  Lines         261      261           
  Branches       87       87           
=======================================
  Hits          250      250           
  Misses          4        4           
  Partials        7        7           

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