Improve PULL_REQUEST_TEMPLATE.md

[andersonjeccel]

Q	A
Bug fix? (use the a.b branch)	🔴
New feature/enhancement? (use the a.x branch)	🟢
Deprecations?	🔴
BC breaks? (use the c.x branch)	🔴
Automated tests included?	🔴
Related user documentation PR URL	mautic/user-documentation#...
Related developer documentation PR URL	mautic/developer-documentation-new#...
Issue(s) addressed	Fixes #...

Description

This PR improves the template used for new pull requests. Specifically:

• Adds emojis which can be used to fill the table answers (like the ones you're seeing here)
• Adds an optional table for Before/After
• Updates the documentation repositories URL
• Improves the description section

Before	After

---

📋 Steps to test this PR:

1. No testing needed?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.51%. Comparing base (aa4ac3c) to head (df6c17b).

❗ Current head df6c17b differs from pull request most recent head 696335f

Please upload reports for the commit 696335f to get more accurate results.

Additional details and impacted files

@@             Coverage Diff              @@
##                5.x   #13727      +/-   ##
============================================
- Coverage     61.93%   61.51%   -0.43%     
+ Complexity    34196    34068     -128     
============================================
  Files          2249     2241       -8     
  Lines        102267   101852     -415     
============================================
- Hits          63337    62651     -686     
- Misses        38930    39201     +271     

see 48 files with indirect coverage changes

[abhisekmazumdar]

The improved template looks easy to understand.

[npracht]

✅

[RCheesley]

LGTM! 🚀