feat: Added a right click option to activity items to allow file observation features

[brkgbr]

The PR addresses #8936

Added a right click menu to activity items to allow users to open the file directly or in a file manager with the file preselected.

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[mgallien]

we will look into it
thanks
I am not sure if the contextual menu is the best way as this is missing an easy way to discover the feature
you may want to have a look at adding this via a visible button (but I am not a designer)

[kra-mo]

Right, there should always be a way to access actions via a visible control. Adding it to the existing … menu makes sense to me, but the context menu can stay as a shortcut :)