chore(maintenance): revamp PR & issue templates

[dreamorosi]

Description of your changes

This PR introduces changes to the PR and Issue templates used to render them.

As discussed in the linked issue, the goal is to make the PR template less verbose and cumbersome while still maintaining all the sections & callouts we need.

The changes introduced are in line with the ones discussed in the issue.

Related issues, RFCs

Issue number: closes #2411

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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[am29d]

Small nitpicks, otherwise good to merge.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud