Closes godotengine/godot-proposals#12681
Improved version of my #107580

Currently, the dependency error dialog is only shown for missing dependencies that are referenced directly by the opening scene. Therefore, if the missing dependency is deeply nested, manually fixing it becomes cumbersome. I guess this is the main reason we devote to improving automatic solutions. However, there are situations where manual fixing is inevitable.

Before	After
Only error messages will be displayed. Clicking OK force opens the scene, making it easy to permanently damage the file.	The dependency error dialog now supports listing and editing indirect missing dependencies.

Folder Button

Locates the missing resource file manually.

Pen Button

Opens the Edit Dependency dialog of the owner in case you want a more detailed view / tool.

Red Cross Mark

If all referers have fixed this dependency, it turns into a green checkmark.

In most cases, clicking the folder button to locate the missing file is sufficient. The tree item is collapsed by default, and there is no need to use the pen button.

The main difference compared to the old version is that it's no longer need to open the Dependency Editor for each file referencing the missing file. Missing files can now be relocated directly within the dependency error dialog. This makes it much easier to resolve deeply nested missing items with multiple references.

The tree view now lists missing files and the resources that reference them, rather than listing the direct dependencies of the currently opening scene and the missing files within them.

Test project with several missing dependencies: deps-mrp.zip