### Godot version

4.0.beta13 (caacade56)

### System information

Windows 10

### Issue description

Seems like this was missed in #62011 and #70540. `@export_multiline` should also support the PackedStringArray datatype on top of Array[String] and Dictionary, but it doesn't, instead giving the error `"@export_multiline" annotation requires a variable of type "String" but type "PackedStringArray" was given instead.`

### Steps to reproduce

Create a PackedStringArray with the `@export_multiline` annotation.
```gdscript
@export_multiline var npc_dialog: PackedStringArray
```

### Minimal reproduction project

N/A
case Variant::PACKED_FLOAT64_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_FLOAT64_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_STRING_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_STRING_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_VECTOR2_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_VECTOR2_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_VECTOR3_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_VECTOR3_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_COLOR_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_COLOR_ARRAY);
					prop = editor;
				} break;
				default: {
				}
			}
			ERR_FAIL_COND(!prop);
			prop->set_read_only(is_read_only());