Refactor FXIOS-12135 Turn off experiments for sync integration tests

[clarmso]

📜 Tickets

Jira ticket

💡 Description

test_sync_bookmark_from_device fails because of a UI change introduced by an experiment on tab tray. Let's not using the experiment for the test for now.

Test run using the branch on MacStadium:
https://storage.googleapis.com/mobile-reports/public/firefox-ios-M1/result_1066/firefox-ios/firefox-ios-tests/Tests/SyncIntegrationTests/results/index.html?sort=result

🎥 Demos

Before	After

Demo

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If needed, I updated documentation and added comments to complex code
• If needed, I added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

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