chore(core): update pull request template

[jtpetty]

Description

Updates the pull request template to remind developers to be explicit for PRs that are partial implementations of an in-progress feature

What to review

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[vercel]

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Name	Status	Preview	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview	Mar 6, 2024 5:23pm
test-studio	✅ Ready (Inspect)	Visit Preview	Mar 6, 2024 5:23pm

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)		Mar 6, 2024 5:23pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Mar 6, 2024 5:30 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	11s	3	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	13s	4	2	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	59s	15	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 2s	18	0	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	13s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	19s	9	0	0