test(containedlist): move to stable - add vrt, avt, storybook docs

[tay1orjones]

Closes #12319

Final steps to mark ContainedList as stable

Changelog

New

• Component has an mdx document that follows our outline
• mdx document provides a prop table
• Component is tested via VRT for all stories
• Component is tested via AVT for the initial render state
• Added platform metadata carbon.yml, added live demo .mdx

Changed

• Move story file out of /next
• Move story out from under Experimental to Components section
• Hide action, children, className from all stories' controls pane

Removed

• unstable_ prefix from ContainedList

Testing / Reviewing

• View all stories, ensure they render and function correctly
• Make sure exports look correct - unstable_ prefix should be gone from both ContainedList and ContainedListItem

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[janhassel]

LGTM, looking forward to having this component promoted to stable 👍

One question / comment: I noticed your removed the second list from both the "Default" and "Disclosed" story. The intent was to show their difference in spacing ("on page" having a top spacing if adjacent to another list while "disclosed" is flush). Do you think it would be worth to bring these back or does the Playground story cover this enough?

[tay1orjones]

One question / comment: I noticed your removed the second list from both the "Default" and "Disclosed" story. The intent was to show their difference in spacing ("on page" having a top spacing if adjacent to another list while "disclosed" is flush). Do you think it would be worth to bring these back or does the Playground story cover this enough?

@janhassel Sorry, I totally missed this detail. I just pushed a commit bringing it back so the VRT will cover that styling and prevent regressions there.

[alisonjoseph]

LGTM 🚀

[tw15egan]

Looks great!