### Godot version

Godot 4.0 Beta 11

### System information

Linux Ubunutu

### Issue description

Godot's 3.x project converter to 4.0 seems to be missing the conversion for two drag data related functions.

In 3.x the function for can drop data, was named  `can_drop_data` in 4.0 it is `_can_drop_data`.
And likewise 3.x had `drop_data` and 4.0 has `_drop_data`.

These two functions were not converted by the project converter (and were hard to notice)!


### Steps to reproduce

Convert a 3.x project to 4.0 with the functions: `can_drop_data` it will not convert to `_can_drop_data` nor `drop_data` to `_drop_data`.



### Minimal reproduction project

N/A
String file_name = dir->_get_next();
			while (file_name != "") {
				if (file_name == ".git" || file_name == ".import" || file_name == ".godot") {
					file_name = dir->_get_next();
					continue;
				
				if (dir->current_is_dir()) {
					directories_to_check.append(current_dir.path_join(file_name) + "/");
				 
					bool proper_extension = false;
					if (file_name.ends_with(".gd") || file_name.ends_with(".shader") || file_name.ends_with(".tscn") || file_name.ends_with(".tres") || file_name.ends_with(".godot") || file_name.ends_with(".cs") || file_name.ends_with(".csproj"))
						proper_extension = true;
					if (proper_extension) {
						collected_files.append(current_dir.path_join(file_name));
					
				
				file_name = dir->_get_next();
			
		 
			print_verbe("Failed to open " + path);
		
	
	return collected_files;
// Test expected results of gdscript
bool rter3To4::test_conversion_gdscript_builtin(String name, String expected, void (rter3To4::*func)(Vector<String> &, const RegExContainer &, bool), String what, const RegExContainer &reg_container, bool builtin_script) {
	Vector<String> got = name.split("\n");
	(this->*func)(got, reg_container, builtin_script);
	String got_str = collect_string_from_vector(got);
	ERR_FAIL_COND_V_MSG(expected != got_str, false, vformat("Failed to convert %s \"%s\" to \"%s\", got instead \"%s\"", what, name, expected, got_str));
	return true;