### 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_MSG(!tiles.has(p_atlas_coords), vformat("TileSetAtlasSource has no tile at %s.", String(p_atlas_coords)));
	while (tiles[p_atlas_coords].alternatives.has(tiles[p_atlas_coords].next_alternative_id)) {
		tiles[p_atlas_coords].next_alternative_id = (tiles[p_atlas_coords].next_alternative_id % 1073741823) + 1; 
	};
}
void TileSetAtlasSource::_clear_coords_mapping_cache(Vector2i p_atlas_coords) {
	ERR_FAIL_COND_MSG(!tiles.has(p_atlas_coords), vformat("TileSetAtlasSource has no tile at %s.", Vector2i(p_atlas_coords)));
	TileAlternativesData &tad = tiles[p_atlas_coords];
	for (int frame = 0; frame < (int)tad.animation_frames_durations.size(); frame++) {
		Vector2i frame_coords = p_atlas_coords + (tad.size_in_atlas + tad.animation_separation) * ((tad.animation_columns > 0) ? Vector2i(frame % tad.animation_columns, frame / tad.animation_columns) : Vector2i(frame, 0));
		for (int x = 0; x < tad.size_in_atlas.x; x++) {
			for (int y = 0; y < tad.size_in_atlas.y; y++) {
				Vector2i coords = frame_coords + Vector2i(x, y);
				if (!_coords_mapping_cache.has(coords)) {
					WARN_PRINT(vformat("TileSetAtlasSource has no cached tile at position %s, the position cache might be corrupted.", coords));
				} else {
					if (_coords_mapping_cache[coords] != p_atlas_coords) {
						WARN_PRINT(vformat("The position cache at position %s is pointing to a wrong tile, the position cache might be corrupted.", coords));
					}
					_coords_mapping_cache.erase(coords);
				}
			}
		}
	}
}
void TileSetAtlasSource::_create_coords_mapping_cache(Vector2i p_atlas_coords) {