Start to use Sauce Labs for cross-browser automated testing

[ehoogerbeets]

Checklist

• [ ] At least one test case is included for this feature or bug fix.
• [ ] ReleaseNotes has added or is not needed.
• [ ] This PR has passed all of the test cases on Nodejs and Chrome Browser.
• [ ] This PR has passed all of the test cases on QT/QML.
• [ ] This is an API breaking change.
• [ ] Requires a major version change.

Issue Resolved / Feature Added

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