[Feature Request] Cannot select variant of select in v-data-table-footer

[sarahsporck]

Problem to solve

Related: #14037
In our whole project we always use the underlined variant for our selects. However it is not possible to select the variant for the select in the v-data-table-footer. It is a hassle to work around this via css stylings, when the solution could be to just pass the variant.

Proposed solution

The option to pass the select variant to the v-data-table-footer or a slot for the VSelect.