Reduce FM Integration Test Impact & Run Time

[zwu52]

Context:

• The FM integration test (IT) is flaky.
• In a workflow, when the IT fails, the workflow normally reports the failure after 50minutes (among 10 minutes are FM IT tests).
• It's too slow to see it fails and rerun.

Goal:

• Make the test flow fail more quickly if it fails.
• Reduce testing time.

This PR:

• Refactors the test suites: separate foreground and background receive checks.
• Make background receive check run last so if the faster test fail, the entire IT fails more quickly.
• From reports get and delete token fails most often for unknown reason, make this test run first for the same reason above.
• Reduce retries from 3 to 2. Retries doesn't seem to help with the majority flakiness issues.

[changeset-bot]

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Latest commit: c1877d5

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[google-oss-bot]

Size Analysis Report

Affected Products

No changes between base commit (05f5bf3) and head commit (553494f).

Test Logs

• Base (05f5bf3): https://github.com/firebase/firebase-js-sdk/actions/runs/684408330
• Head (553494f): https://github.com/firebase/firebase-js-sdk/actions/runs/684479720