feat(platform): Indexed content audit

[francinelucca]

Closes #12948
Closes carbon-design-system/carbon-platform#1565
Closes carbon-design-system/carbon-platform#1567
Closes carbon-design-system/carbon-platform#1483
Closes carbon-design-system/carbon-platform#1543
Closes carbon-design-system/carbon-platform#1485
Closes carbon-design-system/carbon-platform#1525

• Adds Fluid stories as unstable variants of indexed components
• Indexes missing docs
• Adds missing StorybookDemos
• Removes section as is a subcomponent of Heading and we're not indexing subcomponents at this time
• Indexes:
  • Read-only states pattern
  • classPrefix component
  • idPrefix component
  • formLabel component
  • overflowMenuV2 component
  • contextMenu component
  • usePrefix hook
  • useLayer hook
• Renames TooltipDefinition to DefinitionTooltip

Testing / Reviewing

These changes can be tested from carbon-platform-content-sync-test branch in Carbon Platform

TODO:

• Add thumbnails from Jeanie:

  • ContainedList
  • ContextMenu
  • ReadOnlyStates
  • TextDirection
  • LayoutDIrection
  • OverflowMenuV2

• on Merge, merge: docs(carbon): Update tooltip definition ID to match @carbon/styles carbon-components-angular#2429, chore(platform): update tooltip definition in carbon.yml carbon-components-svelte#1640

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