[3.x] Try loading the path specified in a preload(..) method call with the ResourceLoader if the script code completion cache is not yet available

[Maran23]

Fixes: https://github.com/godotengine/godot/issues/69360 Maybe related to: https://github.com/godotengine/godot/issues/35248 (Not sure as I didn't used an external editor, but the issue there sounds very similar)

This fixes the problem that autoloaded nodes could not be loaded because they (or there children) preload other nodes in their script. This was only happening on the start of Godot. When the autoloaded nodes will be resolved there is no code completion cache yet. Same is btw. done above, Line 552.

In editor_node:

• Line 6348: ProjectSettingsEditor is instantiated -> EditorAutoloadSettings -> Autoloaded scenes will be created
• Line 6985: ScriptEditorPlugin is instantiated -> ScriptCodeCompletionCache will be instantiated

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Note: Another possible fix here would be to initialize the ScriptCodeCompletionCache (ScriptCodeCompletionCache::get_singleton()) before resolving the autoloaded scenes. Then the ScriptCodeCompletionCache cache can be reused. (Order needs be changed in editor_node)

Moving down the ProjectSettingsEditor in the instantiation order (after ScriptEditorPlugin) does work and everything looks normal. And the ScriptCodeCompletionCache is created before the autoloaded nodes are created.

Note: This bug does not happen in Godot 4.0