chore: store nodejs build artifacts in placer

[gcf-owl-bot[bot]]

Source-Link: https://github.com/googleapis/synthtool/commit/3602660ae703daadcb7bc2f87bf601241665f3f8 Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:e6d785d6de3cab027f6213d95ccedab4cab3811b0d3172b78db2216faa182e32

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9bcec9d) 68.87% compared to head (21b16cb) 68.87%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #870 +/- ## ======================================= Coverage 68.87% 68.87% ======================================= Files 7 7 Lines 1253 1253 Branches 58 58 ======================================= Hits 863 863 Misses 389 389 Partials 1 1 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=googleapis). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=googleapis)

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