The insights/.../workflows/:BRANCH endpoint in V2 returns only completed (success or failed) endpoints; I'd like a way to programmatically find (and cancel) a currently-running workflow.

Specifically: when one job fails due to flakiness (of our test suite), I want to immediate cancel-and-rerun the rest of the build, rather than wait for the build to finish, and _then_ rerun-from-failed.

More ideal is to let users re-run failed jobs without having to wait for unrelated jobs to finish.