[CI] Add rust installation step to pre-review Android Build CI

Summary: We've had this step in Buildkite for a bit, it should move into the repo.

Test Plan: It's been working for weeks.

Reviewers: varun, jon, abosh, O2 Blocking Reviewers, tomek

Reviewed By: jon, O2 Blocking Reviewers, tomek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D5242