chore: reenable branch-manager

[josephperrott]

No description provided.

[devversion]

LGTM

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "ci/circleci: tests_saucelabs" is failing
     status "ci/circleci: bazel_build_test" is pending
     status "ci/circleci: tests_local_browsers" is pending
     status "ci/circleci: tests_browserstack" is pending
     status "ci/circleci: build_devapp_aot" is pending

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[devversion]

Caretaker note: Saucelabs failing because of https://status.saucelabs.com/incidents/y46340ngq3qk, which now results in a lot of PRs acquiring tunnels.

[angular-automatic-lock-bot]

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