chore: [node] add auto-approve templates, and install dependencies with engines-strict

[gcf-owl-bot[bot]]

chore: add auto-approve templates, and install dependencies with engines-strict

Source-Link: https://github.com/googleapis/synthtool/commit/4a02d97333d1c1642d1b19b00645afdcf4ab36a4 Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:68e1cece0d6d3336c4f1cb9d2857b020af5574dff6da6349293d1c6d4eea82d8

[gcf-merge-on-green[bot]]

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.