Add keyboard shortcut for "Run Test"

It would be a great usability improvement for the application to implement keyboard shortcuts for different actions (like they exist in XWiki Platform, e.g. 'E' for editing a page in-place, 'K' for editing a page in Wiki mode), especially for "Run Test", action which is heavily used, in both View Mode and in run test mode (after filling the run test details, to register the test).

For example, we can assign the key 'R' for this.