Browser tests were only executed for the default configuration of a
system's browser using the SWT.NONE flag. Other configurations, such as
using the Edge browser in Windows, were not tested. A parameterization
has been added to allow other configurations to be tested.

This change adds Edge to the test configurations executed for the
browser. This allows to detect regressions when performing future
changes to the Edge browser.

Fixes
https://github.com/eclipse-platform/eclipse.platform.swt/issues/671

Co-authored-by: Federico Jeanne <Federico.Jeanne@vector.com>