Fix Proto loading for Node tests

[schmidt-sebastian]

Not sure why the CI and my previous runs passed, but now my local Node tests are failing. This fixes the error for me. The new files are imported by firestore.proto

[changeset-bot]

⚠️ No Changeset found

Latest commit: 397d08e

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[github-actions]

Changeset File Check ⚠️

• Changeset formatting error in following file:

  Some packages have been changed but no changesets were found. Run `changeset add` to resolve this error.
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[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/firestore

  Type	Base (2d04af9)	Merge (556afb7)	Diff
  main	454 kB	455 kB	+509 B (+0.1%)

Test Logs

• Base (2d04af9): https://github.com/firebase/firebase-js-sdk/actions/runs/1730635977
• Merge (556afb7): https://github.com/firebase/firebase-js-sdk/actions/runs/1731456054

1. https://storage.googleapis.com/firebase-sdk-metric-reports/dfKyAHteH5.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (2d04af9) and merge commit (556afb7).

Test Logs

• Base (2d04af9): https://github.com/firebase/firebase-js-sdk/actions/runs/1730635977
• Merge (556afb7): https://github.com/firebase/firebase-js-sdk/actions/runs/1731456054

1. https://storage.googleapis.com/firebase-sdk-metric-reports/EVLztixN6v.html