GroovyExtraInformationHover will not delegate to other hovers

When there is a process paused at a breakpoint typically, the variable values hover will be invoked to show the value of a field or local variable.

However, due to the ordering of the hover extensions coming from the platform, the variable values hover never runs when a GroovyExtraInformationHover returns non-null information.

There should be a way to ensure that the variable values hover still gets a chance to run.