### 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
switch (p_what) {
		case NOTIFICATION_DRAW: {
			Size2 grid_size = get_grid_size();
			grid_size.x = get_size().x;
			flag_rects.clear();
			int prev_expansion_rows = expansion_rows;
			expansion_rows = 0;
			const int bsize = (grid_size.height * 80 / 100) / 2;
			const int h = bsize * 2 + 1;
			Color color = get_theme_color(read_only ? SNAME("disabled_highlight_color") : SNAME("highlight_color"), SNAME("Editor"));
			Color text_color = get_theme_color(read_only ? SNAME("disabled_font_color") : SNAME("font_color"), SNAME("Editor"));
			text_color.a *= 0.5;