remove side effect imports in exp build

[Feiyang1]

Remove import '@firebase/app-types'; from the bundle

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Latest commit: d8e1adb

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[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (d42bb39) and head commit (ec5b7d1).

Test Logs

• Base (d42bb39): https://github.com/firebase/firebase-js-sdk/actions/runs/502440667
• Head (ec5b7d1): https://github.com/firebase/firebase-js-sdk/actions/runs/502469914