[GH1] Add linalg related changes to merge rules
This PR would allow Quansight linear algebra experts (in addition to metamates) to approve sparse related changes. Linear algebra would be a great place to start encouraging more GitHub 1st (GH1) landing to test our external contributor GH1 experience.
This is DIFFERENT from the superuser rule because it allows non-metamates to be approvers.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75881
Approved by: https://github.com/osalpekar
