feat(pie-checkbox-group): DSW-1937 a11y improvements

[dandel10n]

Problem: shadow DOM limitation for ARIA attributes binding + fieldset with checkboxes not announcing aria-describedby element text in VoiceOver and NVDA (known bug in screenreaders)
More info: https://www.matuzo.at/blog/2023/web-components-accessibility-faq/aria-references/ and nvaccess/nvda#12718

Solution: making PIE Assistive Text component optionally visually hidden to pass error information down to each Checkbox in Checkbox Group for assistive tech to have the error info while visually error will be shown only under Checkbox Group.

No visual changes to components introduced. PIE Docs Percy test shows a new prop added to PIE Assistive Text.

Author Checklist (complete before requesting a review)

• I have performed a self-review of my code
• I have reviewed the PIE Storybook/PIE Docs PR preview
• If changes will affect consumers of the package, I have created a changeset entry.

Reviewer 1 - @xander-marjoram

• I have reviewed the PIE Storybook / PIE Docs PR previews
• I have reviewed the visual test changes

Reviewer 2 - @jamieomaguire

• I have reviewed the PIE Storybook / PIE Docs PR previews
• I have reviewed the visual test changes

[changeset-bot]

🦋 Changeset detected

Latest commit: c505cb4

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

This PR includes changesets to release 16 packages

Name	Type
@justeattakeaway/pie-assistive-text	Minor
@justeattakeaway/pie-checkbox-group	Minor
@justeattakeaway/pie-checkbox	Minor
pie-docs	Patch
pie-storybook	Patch
@justeattakeaway/pie-text-input	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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