Edge browser: activate tests

[akoch-yatta]

No description provided.

[fedejeanne]

@HeikoKlare IIRC you wanted to take care of this one?

If not, remove yourself as Assignee.

[HeikoKlare]

No, this issue is open to be picked by anyone having time to address it. It is of highest priority, so we should not wait for anyone specific to work on it.

[HeikoKlare]

Experiments on this issue can be found here: eclipse-platform/eclipse.platform.swt#672

Still, some tests fail undeterministically in GitHub Actions. Locally, they usually run fine. We need to investigate why they fail and resolve the causing issue.

Since we have now enabled Edge by default, enabling the tests should be addressed with high priority. Thus, I increased the priority of this issue.