Create VertexAI Node CJS and ESM bundles

[dlarocque]

Create a new Node entrypoint index.node.ts where we can make Node-specific modifications to the bundles. This will be required for upcoming features where Node and Web bundles use different libraries.

Question: Should we still be getting the appCheckProvider in a Node bundle?

[changeset-bot]

🦋 Changeset detected

Latest commit: 7e452ad

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@firebase/vertexai	Patch
firebase	Patch

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (178ad99) and merge commit (e94a436).

Test Logs

• Base (178ad99): https://github.com/firebase/firebase-js-sdk/actions/runs/12952885206
• Merge (e94a436): https://github.com/firebase/firebase-js-sdk/actions/runs/12953112012

1. https://storage.googleapis.com/firebase-sdk-metric-reports/p5rNIh9HN1.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (178ad99) and merge commit (e94a436).

Test Logs

• Base (178ad99): https://github.com/firebase/firebase-js-sdk/actions/runs/12952885206
• Merge (e94a436): https://github.com/firebase/firebase-js-sdk/actions/runs/12953112012

1. https://storage.googleapis.com/firebase-sdk-metric-reports/gzOXLpt9Yx.html