C4AI Slug: Update callout in the Figma library to match what was built

[mattrosno]

Tasks

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1. Make callout more composable with variants
2. Update styles to match code
3. Add shark fin

[mattrosno]

@aagonzales can you add details and importance? I specified the Slug area in the project board, but did not add to the Slug styles and React epic, as this seems like something that can be done later (doesn't block the web components slug.)

[mattrosno]

Anna:

The [callout] sharkfin wasn't originally included so we need to add it to the shared Figma library asset.

[aagonzales]

Data table updates:

AI slug moved beside the label to accommodate for the sort icon. Otherwise the slug sets 40px in from the right edge and looks like a bug.

Aura gradient only spans the header cell and not down the column due to technical difficulties. This may be readdress in the future but this is the MVP solution for phase 1.

[aagonzales]

Closing this issue, in favor of a new kit issue that will combine the call and slug together in one component and include the slug.
carbon-design-system/carbon-design-kit#760