ci: disable fail-fast for integration tests

[abn]

Pull Request Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off

[bmarty]

Hello @abn , are you trying to fix the integration test on GitHub actions? I'm very interesting about it...

[abn]

I think this one can be merged without fixing the integration tests themselves. I have not looked at the integration tests themselves however, happy to pair up to help with that too.