build(node): add new jsteam + enforce branches up-to-date (#1451)

[gcf-owl-bot]

Source-Link: googleapis/synthtool@cd78529
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:ddb19a6df6c1fa081bc99fb29658f306dd64668bc26f75d1353b28296f3a78e6

BEGIN_COMMIT_OVERRIDE
fix(types): loosen AbortSignal type
END_COMMIT_OVERRIDe

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.