chore: update PR template to reduce manual editing

[yocaba]

What

Improves the PR template by rewording the checkboxes so authors still consider each point, but can tick every box without editing the list in almost all cases. Same change as opendefensecloud/solution-arsenal#847.

Why

Kept finding myself either editing the checklist below on many PRs or not checking the first box at all. Both bothered me.

Testing

none

Checklist

• Tests added/updated, or confirmed that no tests are required
• No breaking changes, or upgrade path documented above
• Readable commit history (squashed and cleaned up as desired)
• AI code review considered and comments resolved

[coderabbitai]

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