Revert "[Array API] Add linalg.vecdot (#70542)"
This reverts commit 74208a9c68b5892b9dde39d06350fe7b92691429.
Reverted https://github.com/pytorch/pytorch/pull/70542 on behalf of https://github.com/malfet due to Broke CUDA-10.2 for vecdot_bfloat16, see https://hud.pytorch.org/pytorch/pytorch/commit/74208a9c68b5892b9dde39d06350fe7b92691429
