fix(DataTableSkeleton): use new classnames

[vpicone]

closes #2198

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[jendowns]

Thank you @vpicone! Just one question -- are there any contingencies for v9? (where that -v2 suffix might still apply? given that the styles are feature-flagged?)

[jendowns]

Thanks @vpicone! Just one question -- are their any contingencies for pre-v10 so that the class name could still have the -v2 suffix for those earlier versions? (given that the styles are feature-flagged)

[vpicone]

@jendowns As we start removing feature flags, more and more v9 stuff will break. Unfortunately we can't support using versions of carbon-components v9 with carbon-react v7 going forward.

[asudoh]

LGTM 👍 - Thanks @vpicone!