Fix scene tree selection

[Hilderin]

This PR should fix #91254 and fix #91411

I tried to modify as little code as possible while maintaining the fix for #90636

The problem was caused by the addition of SceneTreeDock::get_singleton()->set_selection in the editor_node. Modifying the editor_selection from outside the SceneTreeDock seems causing a lot of problem so I just update the scene selection when moving back or forward in the Inspector which was the original bug.

godot.windows.editor.dev.x86_64_0X5QxlZ2MW.mp4

godot.windows.editor.dev.x86_64_A7yHIBuy0Y.mp4

godot.windows.editor.dev.x86_64_NUCtcBJl3w.mp4

• Bugsquad exit, see also: Fix no reparent after hover and no move. #91439

[YeldhamDev]

Alternatives to this PR: #91435 & #91439

[akien-mga]

CC @ajreckof

[ajreckof]

I feel like this is a band-aid that will make a lot of problems of editor selection not being in sync with the actual selection reappear. Both cases that were reported where for me cases where the code used a function that should have updated selection but was not updating EditorSelection and the code relied on this broken behavior.

[Hilderin]

I'm closing this PR, I think the other PRs suggested are superior!