fix(pie-checkbox): DSW-000 design review comments

[dandel10n]

Describe your changes (can list changeset entries if preferable)

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"@justeattakeaway/pie-checkbox": minor

[Changed] - cursor styling for disabled state changed from default to not-allowed.
[Added] - transition styles to border colour in addition to background colour.

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"@justeattakeaway/pie-checkbox-group": minor

[Changed] - replaced label prop with a slot.
[Changed] - increased spacing after label and before assistive text.
[Changed] - reduced spacing detween checkboxes in inline mode.

Author Checklist (complete before requesting a review)

• I have performed a self-review of my code
• I have reviewed the PIE Storybook PR preview
• I have reviewed visual test updates properly before approving
• If changes will affect consumers of the package, I have created a changeset entry.

Reviewer checklists (complete before approving)

Reviewer 1

• I have reviewed the PIE Storybook PR preview: https://pr1660-storybook.pie.design/
• If there are visual test updates, I have reviewed them

Reviewer 2 @raoufswe

• I have reviewed the PIE Storybook PR preview: https://pr1660-storybook.pie.design/
• If there are visual test updates, I have reviewed them

[changeset-bot]

🦋 Changeset detected

Latest commit: 7655020

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@justeattakeaway/pie-checkbox	Minor
@justeattakeaway/pie-checkbox-group	Minor
pie-storybook	Patch
@justeattakeaway/pie-webc	Patch
wc-angular12	Patch
wc-next10	Patch
wc-next13	Patch
wc-nuxt2	Patch
wc-nuxt3	Patch
wc-react17	Patch
wc-react18	Patch
wc-vanilla	Patch
wc-vue3	Patch

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[ashleynolan]

Couple of small comments