refactor: move default PR template

[jsjoeio]

This PR fixes the default PR template.

To set the default, we must follow this structure:

.github
    -> PULL_REQUEST_TEMPLATE.md (This going to be the default one)
    -> PULL_REQUEST_TEMPLATE (folder)
        -> custom1 
        -> custom2

source: https://github.uint.cloudmunity/t/multiple-pull-request-template/874/10

Checklist

• updated CHANGELOG.md

[codecov]

Codecov Report

Merging #3375 (7a3936d) into main (b49b179) will not change coverage.
The diff coverage is n/a.

❗ Current head 7a3936d differs from pull request most recent head 6f09749. Consider uploading reports for the commit 6f09749 to get more accurate results

@@           Coverage Diff           @@
##             main    #3375   +/-   ##
=======================================
  Coverage   59.21%   59.21%           
=======================================
  Files          35       35           
  Lines        1709     1709           
  Branches      379      379           
=======================================
  Hits         1012     1012           
  Misses        559      559           
  Partials      138      138           

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