### 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
if (layer_index >= layer_count) {
					if (!flag_rects.is_empty() && (expansion_rows == 0)) {
						const Rect2 &last_rect = flag_rects[flag_rects.size() - 1];
						arrow_pos = last_rect.get_end();
					}
					break;
				}
				int block_size_x = layer_group_size * (bsize + 1);
				block_ofs.x += block_size_x + 3;
				if (block_ofs.x + block_size_x + 12 > grid_size.width) {
					
					if (!flag_rects.is_empty() && (expansion_rows == 0)) {
						const Rect2 &last_rect = flag_rects[flag_rects.size() - 1];
						arrow_pos = last_rect.get_end();
					}
					++expansion_rows;
					if (expanded) {
						
						block_ofs.x = 4;
						block_ofs.y += 2 * (bsize + 1) + 3;
					} else {
						
						break;
					}
				}
			}
			if ((expansion_rows != prev_expansion_rows) && expanded) {
				update_minimum_size();
			}
			if ((expansion_rows == 0) && (layer_index == layer_count)) {