[Adalennis]

Fixes #9379

Since #5275, the dialogs that reference a pipeline or workflow have an Open button next to Browse. The option that holds the file now mentions it on the pages of the Pipeline executor, Workflow executor, Simple mapping, Multi mapping, Metadata injection, Kafka consumer and Azure Event Hubs listener transforms, and of the Pipeline, Workflow and Repeat actions:

• Open opens the file in Hop Gui, or switches to it when it is already open. When the dialog has unsaved changes, Hop first asks whether to save them (ReferencedFileOpener).
• In the Pipeline executor and Workflow executor, Open is disabled when the file name comes from a field.
• In Multi mapping the same button is labelled Edit, next to a New button that creates an empty pipeline file. The page uses those names.

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[bamaer]

Thanks @Adalennis, LGTM. I checked the ten pages against the dialogs on main: they're the ten that use ReferencedFileOpener, and the save prompt, the disabled button in the executors and the Multi mapping Edit/New labels match the code. All ten pages render fine with asciidoctor. Code and docs reviewed, Hop Gui not run.

Minor, optional: in Multi mapping, New first asks where to save the file, so something like "New asks for a file name, creates an empty pipeline there and uses it" would be a bit more precise.