Datagrid: slug --> aiLabel renaming

[matthewgallo]

Tasks

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1. Change slug prop to aiLabel
2. Deprecate slug prop
3. Add new duplicate classname selectors to the ailabel.scss styles
4. Update classnames within AILabel components to use the new #{$prefix}--ailabel names
5. Create a new sub-issue/tasklist item on https://github.com/carbon-design-system/ibm-products/issues for removing these classes as part of new major version

For duplicate class, this is an example:

- .#{$prefix}--slug .#{$prefix}--slug__button {

+ .#{$prefix}--slug .#{$prefix}--slug__button,
+ .#{$prefix}--ai-label .#{$prefix}--ai-label__button {

[wkeese]

Hmm, I don't like the sounds of that... because we are using the slug for another purpose. Relatedly, see the ticket carbon-design-system/carbon#17303 that I filed.