Group firestore-compat and auth-compat properly in test config

[hsubox76]

firestore-compat belongs with firestore, auth-compat belongs with auth in the separated test configs for the "test-changed" script. Made sure to exclude them from the "core" config as well.

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Latest commit: f7b5286

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (c1b9cf1) and merge commit (7c22c30).

Test Logs

• Base (c1b9cf1): https://github.com/firebase/firebase-js-sdk/actions/runs/1826095000
• Merge (7c22c30): https://github.com/firebase/firebase-js-sdk/actions/runs/1831021053

1. https://storage.googleapis.com/firebase-sdk-metric-reports/TAbhtAYz0r.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (c1b9cf1) and merge commit (7c22c30).

Test Logs

• Base (c1b9cf1): https://github.com/firebase/firebase-js-sdk/actions/runs/1826095000
• Merge (7c22c30): https://github.com/firebase/firebase-js-sdk/actions/runs/1831021053

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