fix(14831): update component and getter function types to match (#17135)

* fix(datatable): update component and getter function types to match

Update <TableExpandRow />, <TableSelectAll />, <TableSelectRow /> props
to make checked and isSelected nullable since they already expect
undefined or default to a boolean value anyway. This allows the values
returned by getSelectionProps and getRowProps to be more consistent.
This should resolve typescript errors that occur when using official
examples.

* chore: run yarn format

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Co-authored-by: Taylor Jones <[email protected]>