Remove MTE-2697 Disable Firefox smoke tests in Github Actions

[clarmso]

📜 Tickets

Jira ticket

💡 Description

Even after the Xcode 16 upgrade, Firefox smoke tests are still flaky. Let's turn them off for now.

The workflow is still available by dispatching it manually.

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

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