### 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
Color text_color_on = get_theme_color(read_only ? SNAME("disabled_font_color") : SNAME("font_hover_color"), SNAME("Editor"));
			text_color_on.a *= 0.7;
			const int vofs = (grid_size.height - h) / 2;
			int layer_index = 0;
			Point2 arrow_pos;
			Point2 block_ofs(4, vofs);
			while (true) {
				Point2 ofs = block_ofs;
				for (int i = 0; i < 2; i++) {
					for (int j = 0; j < layer_group_size; j++) {
						const bool on = value & (1 << layer_index);
						Rect2 rect2 = Rect2(ofs, Size2(bsize, bsize));
						color.a = on ? 0.6 : 0.2;
						if (layer_index == hovered_index) {
							
							color.a += 0.15;
						}
						draw_rect(rect2, color);
						flag_rects.push_back(rect2);
						Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
						int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
						Vector2 offset;
						offset.y = rect2.size.y * 0.75;
						draw_string(font, rect2.position + offset, itos(layer_index + 1), HORIZONTAL_ALIGNMENT_CENTER, rect2.size.x, font_size, on ? text_color_on : text_color);
						ofs.x += bsize + 1;
						++layer_index;
					}
					ofs.x = block_ofs.x;
					ofs.y += bsize + 1;
				}