Include full output from mocha/karma in CI

[dconeybe]

This effectively reverts #2980 but the reduced output in CI is too terse to diagnose some Firestore CI issues. And I don't think that having more output is a bad thing, even when there are failures.

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Latest commit: 67c2eed

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (4ae8041) and merge commit (7221f21).

Test Logs

• Base (4ae8041): https://github.com/firebase/firebase-js-sdk/actions/runs/5882436881
• Merge (7221f21): https://github.com/firebase/firebase-js-sdk/actions/runs/5882524785

1. https://storage.googleapis.com/firebase-sdk-metric-reports/90uyKUTffF.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (4ae8041) and merge commit (7221f21).

Test Logs

• Base (4ae8041): https://github.com/firebase/firebase-js-sdk/actions/runs/5882436881
• Merge (7221f21): https://github.com/firebase/firebase-js-sdk/actions/runs/5882524785

1. https://storage.googleapis.com/firebase-sdk-metric-reports/CPywdvS7r7.html