[5.x] Improve feedback when action fails

[simonerd]

replaces concerned parts of #10191 requires changes in Revisable from #10263

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With the changes in #10263 the publishWorkingCopy and unpublishWorkingCopy return false when save fails (e. g. because an entrySaving listener returns false). When working on this I realised that the publish/unpublish actions don't show any errors if saving fails. In this PR I added a way of letting an action fail and optionally add a message that will be shown in the error toast.

// edit: extended to also cover the 'delete' action

Additionally, I was not quite happy with the handling of the action modal. So far, if the action was not successful, the confirmation modal would still be shown and an error toast would pop up. This kind of suggests that something went technically wrong, as the interface is stuck – similar to when an ajax error occurres.

I felt like it would be more appropriate if the modal closes, but the error toast doesn't just give you a generic "action failed" answer. To get there, I introduced a status information to the ActionController response, and adjusted the modal handling based on that status. Errors because of missing auth or something else still leave the modal open, while unsuccessful publish/unpublish actions close the modal and show an error toast.

[simonerd]

We just realised in a different case that this also applies to the 'delete' action. I have extended the code to also cover that.