Revert "Disable linux-bionic-py3_7-clang8-xla-test (#87737)"
This reverts commit 21f7e7d040c646b4ce7f4a4e973da97660462bdc.
Reverted https://github.com/pytorch/pytorch/pull/87737 on behalf of https://github.com/kit1980 due to Re-enable XLA tests after https://github.com/pytorch/pytorch/pull/87818
