Change Firestore CI

[cherylEnkidu]

#no-changelog

PR Title: Fix Firestore Enterprise CI hangs & Add Enterprise Integration Tests

Description

This PR addresses persistent timeouts in FirestoreEnterprise jobs caused by resource exhaustion (OOM) on GitHub runners and expands Enterprise test coverage.

Changes

• CI Stability: Throttled xcodebuild concurrency (-jobs 4) and split execution into separate build-for-testing and test-without-building steps. This prevents memory contention between the compiler and the Firestore Emulator.
• New Tests: Added dedicated Enterprise integration test schemes for iOS, macOS, and tvOS.

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[ncooke3]

Do we want to test both backend and non-backend?

[cherylEnkidu]

Do we want to test both backend and non-backend?

Yes, I am checking here to see whether the environment variable works. Ideally the test set should be like:

1. TARGET_BACKEND = nightly BACKEND_EDITION = standard
2. TARGET_BACKEND = nightly BACKEND_EDITION = enterprise
3. TARGET_BACKEND = emulator BACKEND_EDITION = standard
4. TARGET_BACKEND = emulator BACKEND_EDITION = enterprise

[laike9m]

The pull request introduces several improvements to Firestore CI and adds Enterprise integration tests. However, there are a few issues that need to be addressed, including a syntax error in scripts/build.sh that will break the CI, and a potential regression in pipeline behavior for Standard databases.

[ncooke3]

Great work!

[wu-hui]

I have one question, otherwise looks good.