chore: Reorganize pull request template

[rabbitstack]

What is the purpose of this PR / why it is needed?

Make the pull request template require less legwork to fill out.

What type of change does this PR introduce?

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Refactor (non-breaking change that restructures the code, while not changing the original functionality)
• [ ] Docs
• [ ] Other

Any specific area of the project related to this PR?

• [ ] Instrumentation/telemetry
• [ ] Rule engine
• [ ] Filters
• [ ] YARA scanner
• [ ] Captures
• [ ] Alert senders
• [ ] Outputs
• [ ] Detection rules
• [ ] Filaments
• [ ] Configuration
• [ ] CLI
• [ ] Tests
• [ ] CI
• [ ] Build
• [ ] Docs
• [x] Other

Special notes for the reviewer:

Does this PR introduce a user-facing change?