Trigger internal repo only for commits from team
Test Plan:
buildkite
- tested without build.branch=='master' and build included triggered pipeline
- tested with build.branch=='master' && build.creator.email =~ /elementl.com$$/ and triggered internal pipeline is skipped
- will confirm this works with external contributors when landing external PR https://github.com/dagster-io/dagster/pull/3479
Reviewers: bob, rexledesma
Reviewed By: rexledesma
Differential Revision: https://dagster.phacility.com/D5906