BUG: scalar indexing on 2D DTA/TDA/PA
cc @jorisvandenbossche this fixes the issue with `DatetimeLikeBlockMixin.iget` discussed in #33252

Note: this sits on top of #33290.
@jbrockmendel now #33290 is merged, this can be updated / merged? > this can be updated / merged?

This is good to go