[ci] write test suites to rockset
Currently we upload all `testcase` elements as individual test runs to
Rockset. It would be nice to also have `testsuite`s as well, which
aggregate high level information.
These aggregations could technically be performed in the backend, but it's
faster to just log the data since we already have it in the XML test
report.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/79265
Approved by: https://github.com/seemethere
