Remove some unused NPM token env variables

[hsubox76]

• messaging-types - removed 2 years ago
• polyfill - removed with v9
• testing - not used?
• vertexai - we are using vertexai-preview for now

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7defc88

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (ca41391) and merge commit (848bfeb).

Test Logs

• Base (ca41391): https://github.com/firebase/firebase-js-sdk/actions/runs/9603508535
• Merge (848bfeb): https://github.com/firebase/firebase-js-sdk/actions/runs/9619234529

1. https://storage.googleapis.com/firebase-sdk-metric-reports/aFfNB50XVV.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (ca41391) and merge commit (848bfeb).

Test Logs

• Base (ca41391): https://github.com/firebase/firebase-js-sdk/actions/runs/9603508535
• Merge (848bfeb): https://github.com/firebase/firebase-js-sdk/actions/runs/9619234529

1. https://storage.googleapis.com/firebase-sdk-metric-reports/fE7OGfE9M3.html