Update CONTRIBUTING.md and issue template

[peelar]

Scope of the change

Update CONTRIBUTING.md and issue template according to new Contribution process

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2800966

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.13%. Comparing base (e298bd4) to head (2800966).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #5484    +/-   ##
========================================
  Coverage   63.13%   63.13%            
========================================
  Files        1290     1290            
  Lines       22330    22330            
  Branches     4595     4609    +14     
========================================
  Hits        14099    14099            
+ Misses       8195     7684   -511     
- Partials       36      547   +511     

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