Add Icon shortcut to ParseBuildOutput in CompileOutput pane

Parsing external build output is great, see https://doc.qt.io/qtcreator/creator-reference-compile-output-view.html#parsing-existing-compile-output

It would be nice if the compile output pane had an extra "Open" icon that opens the ParseBuildOutput dialog:

in the same fashion than Debugger-Clang-Tidy pane has an "Open" icon for external XML files:

It would be thus more self-consistent to have the "Open" icon in both panes, as they perform almost the same functionality, and would improve the visibility of the ParseBuildOutput function, which is very relevant nowadays that the are many GitHub CIs script / raw-logs that need to be retrofitted into QtCreator for fixes.

Thanks for this great tool!