phases: check secret presence the right way during discovery There is an official function for this, lets use it. This will prevent the code to break in the future while we refactor the phase code.

phases: explicitly filter stripped revision at strip time Explicit is better than implicit. The current logic is bit subtle and fragile. It also get in the way of using something else than node-id as internal storage. We replace it with a more explicit filtering while striping.

debug: add a debug::unbundle command that simulate the unbundle from a push The code have different behavior when the unbundle comes from a push, so we introduce a command that can simulate such unbundle. For our copy of mozilla-try-2023-03-22, this make the unbundle jump from 2.5 seconds (with `hg unbundle`) to 15 seconds (with `hg debug::unbundle`). That 15 seconds timings is consistent with the issue seen in production.

perf: support --template on perf::phases