Fix remote-config-exp installations import

[hsubox76]

If this import is not in the same file that uses the code (that has the getProvider() call), this import gets tree-shaken out during the rollup build and installations fails to register. (The error won't happen if there's another library, like performance, bringing in installations.)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 125b551

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (44b5251) and head commit (25ee5a9).

Test Logs

• Base (44b5251d): https://github.com/firebase/firebase-js-sdk/actions/runs/413671075
• Head (25ee5a98): https://github.com/firebase/firebase-js-sdk/actions/runs/414256524

[Feiyang1]

Interesting, but I'm not sure getProvider() decides whether or not the import is tree shaken because it's a side effect import and I don't think rollup is capable of knowing whether things in @firebase/installations-exp is used or not in the importing module.

Actually I think import @firebase/installations-exp should always be removed regardless of its location because we set moduleSideEffect: true in the rollup config. It may be a bug in rollup, or something I don't fully understand. For now, the PR is good to go to unblock the releases.