test: implement retries and remove useless config

[luans-qa]

Description

Remove useless config for fullyParallel: true, as we use workers: 1 which enforces serial execution, and we can't safely run in parallel
Add a retry to avoid flaky tests

Test plan

Package updates

_{Last reviewed commit: 7c6e615}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7c6e615

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[github-actions]

🔥 Smoke Test Results

✅ Status: Passed

Statistics

• Total Tests: 5
• Passed: 5 ✅
• Failed: 0
• Skipped: 0
• Duration: 5.52 min

✅ All smoke tests passed!

All critical flows are working correctly.

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This is a non-blocking smoke test. Full regression tests run separately.