### Godot version

v4.0.3.stable.mono.official [5222a99f5]

### System information

macOS Monterey 12.6.6 (21G646)

### Issue description

When creating a tileset by code with custom data layers, removing a layer with `remove_custom_data_layer` does not update the name-to-layer mapping; `get_custom_data_layer_by_name` will continue to return that layer's original index.

This has a downstream effect of causing TileData objects attempting to use `get_custom_data('Layer B')` to return invalid data (whatever custom data is now in Layer B's old index; e.g. Layer C).

I would expect that after using `remove_custom_data_layer`, I would be able to still use `get_custom_data_layer_by_name` on that tileset.

### Steps to reproduce

Run this code to see that getting Layer B by name after removing the first layer continues to return its original index (1) when in reality it is now at index 0.
```
	var tileset:TileSet = TileSet.new()

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(0, 'Layer A')
	tileset.set_custom_data_layer_type(0, TYPE_INT)

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(1, 'Layer B')
	tileset.set_custom_data_layer_type(1, TYPE_STRING)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer A
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # Layer B
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # 1

	print('----- removing custom data layer 0 -----')
	tileset.remove_custom_data_layer(0)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer B
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # prints an error, as expected
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # returns 1 still! should return 0.
```

### Minimal reproduction project

[RemoveCustomDataLayer.zip](https://github.com/godotengine/godot/files/11804762/RemoveCustomDataLayer.zip)

ERR_FAIL_COND_V_MSG(!tiles.has(p_atlas_coords), TileSetSource::INVALID_TILE_ALTERNATIVE, vformat("The TileSetAtlasSource atlas has no tile at %s.", String(p_atlas_coords)));
	ERR_FAIL_INDEX_V(p_index, tiles[p_atlas_coords].alternatives_ids.size(), TileSetSource::INVALID_TILE_ALTERNATIVE);
	return tiles[p_atlas_coords].alternatives_ids[p_index];
}
TileData *TileSetAtlasSource::get_tile_data(const Vector2i p_atlas_coords, int p_alternative_tile) const {
	ERR_FAIL_COND_V_MSG(!tiles.has(p_atlas_coords), nullptr, vformat("The TileSetAtlasSource atlas has no tile at %s.", String(p_atlas_coords)));
	ERR_FAIL_COND_V_MSG(!tiles[p_atlas_coords].alternatives.has(p_alternative_tile), nullptr, vformat("TileSetAtlasSource has no alternative with id %d for tile coords %s.", p_alternative_tile, String(p_atlas_coords)));
	return tiles[p_atlas_coords].alternatives[p_alternative_tile];
}
void TileSetAtlasSource::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_texture", "texture"), &TileSetAtlasSource::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture"), &TileSetAtlasSource::get_texture);
	ClassDB::bind_method(D_METHOD("set_margins", "margins"), &TileSetAtlasSource::set_margins);
	ClassDB::bind_method(D_METHOD("get_margins"), &TileSetAtlasSource::get_margins);
	ClassDB::bind_method(D_METHOD("set_separation", "separation"), &TileSetAtlasSource::set_separation);
	ClassDB::bind_method(D_METHOD("get_separation"), &TileSetAtlasSource::get_separation);
	ClassDB::bind_method(D_METHOD("set_texture_region_size", "texture_region_size"), &TileSetAtlasSource::set_texture_region_size);
	ClassDB::bind_method(D_METHOD("get_texture_region_size"), &TileSetAtlasSource::get_texture_region_size);
	ClassDB::bind_method(D_METHOD("set_use_texture_padding", "use_texture_padding"), &TileSetAtlasSource::set_use_texture_padding);
	ClassDB::bind_method(D_METHOD("get_use_texture_padding"), &TileSetAtlasSource::get_use_texture_padding);
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture2D", PROPERTY_USAGE_NO_EDITOR), "set_texture", "get_texture");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2I, "margins", PROPERTY_HINT_NONE, "suffix:px", PROPERTY_USAGE_NO_EDITOR), "set_margins", "get_margins");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2I, "separation", PROPERTY_HINT_NONE, "suffix:px", PROPERTY_USAGE_NO_EDITOR), "set_separation", "get_separation");
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2I, "texture_region_size", PROPERTY_HINT_NONE, "suffix:px", PROPERTY_USAGE_NO_EDITOR), "set_texture_region_size", "get_texture_region_size");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_texture_padding", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR), "set_use_texture_padding", "get_use_texture_padding");
	
	ClassDB::bind_method(D_METHOD("create_tile", "atlas_coords", "size"), &TileSetAtlasSource::create_tile, DEFVAL(Vector2i(1, 1)));
	ClassDB::bind_method(D_METHOD("remove_tile", "atlas_coords"), &TileSetAtlasSource::remove_tile); 
	ClassDB::bind_method(D_METHOD("move_tile_in_atlas", "atlas_coords", "new_atlas_coords", "new_size"), &TileSetAtlasSource::move_tile_in_atlas, DEFVAL(INVALID_ATLAS_COORDS), DEFVAL(Vector2i(-1, -1)));