Investigate how to access X button on Linux

[Valentina1133]

As was discussed with Noelia, I created a task to check how can we access X button on Linux.

I believe it's really important because we will face similar issues for sure, because we run tests on Linux and there are more such elements for 100%.

#20 - I worked on this and it has been done for Mac, but we cannot access object on Linux (via Squish)

Also methods close() and sending event close are not working here (we need literally click X button )