feat(layouts): add layout switching capabilities
impr(variables): add tooltip with the variable machine name
fix(groups): change the modal close button appearance

To match the start process modal close button.

Related to: CAM-2740
fix(task list): truncate the assignee name if too long

impr(styles): add a text truncate mixin

Truncating a text using CSS takes several properties.
This commit adds a mixin to simplify that.

Related to: CAM-2824
impr(timepicker): limit the width of time inputs