Handle initializer case in FullyQualifiedSyntax

- Prevents source generators from fully qualifying names being assigned to within an object initializer
- Adds ResourceTextureWithInitializer test cases to ExportedFields and ExportedProperties

Co-Authored-By: Paul Joannon <437025+paulloz@users.noreply.github.com>
Co-Authored-By: Paviel Kraskoŭski <kraskovskiy94@gmail.com>

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/Sources/ExportedFields.cs

@@ -88,6 +88,7 @@ public partial class ExportedFields : GodotObject
     // Classes
     [Export] private GodotObject _fieldGodotObjectOrDerived;
     [Export] private Godot.Texture _fieldGodotResourceTexture;
+    [Export] private Godot.Texture _fieldGodotResourceTextureWithInitializer = new() { ResourceName = "" };
     [Export] private StringName _fieldStringName = new StringName("foo");
     [Export] private NodePath _fieldNodePath = new NodePath("foo");
     [Export] private Rid _fieldRid;

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Tests/TestData/Sources/ExportedProperties.cs

@@ -207,6 +207,7 @@ public partial class ExportedProperties(string primaryCtorParameter) : GodotObje
     // Classes
     [Export] private GodotObject PropertyGodotObjectOrDerived { get; set; }
     [Export] private Godot.Texture PropertyGodotResourceTexture { get; set; }
+    [Export] private Godot.Texture PropertyGodotResourceTextureWithInitializer { get; set; } = new() { ResourceName = "" };
     [Export] private StringName PropertyStringName { get; set; } = new StringName("foo");
     [Export] private NodePath PropertyNodePath { get; set; } = new NodePath("foo");
     [Export] private Rid PropertyRid { get; set; }