flake: TestRunCommandGraceful_context cancel

Created by: coury-clark

Flake in https://sourcegraph.sourcegraph.com/github.com/sourcegraph/sourcegraph/-/blob/cmd/gitserver/server/server_test.go?L1541&utm_campaign=search&utm_source=raycast-sourcegraph

https://buildkite.com/sourcegraph/sourcegraph/builds/167350#0182a740-e3ed-4ea2-b981-08a7a76de09d

/cc @jplahn @ryphil