apply linter to rpc test files (#32659)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32659
Applies linter to RPC test files so that we can use linter shortcuts
without getting unnecessary changes to the whole file.
ghstack-source-id: 97361237
Test Plan: No actual changes.
Differential Revision: D19584742
fbshipit-source-id: a11ce74ee0e2817e6f774fff7c39bcab06e99307
