### 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
for (int k = 0; k < reason.size(); k++) {
			print_line(reason[k]);
		
	
	print_line(vformat("Conversion ended - all files(%d), converted files: (%d), not converted files: (%d).", collected_files.size(), converted_files, collected_files.size() - converted_files));
	uint64_t conversion_end_time = Time::get_singleton()->get_ticks_msec();
	print_line(vformat("Conversion of all files took %10.3f seconds.", (conversion_end_time - conversion_start_time) / 1000.0));
	return 0;
;
// Function responsible for validating project conversion.
int rter3To4::validate_conversion() {
	print_line("Starting checking if project conversion can be done.");
	uint64_t conversion_start_time = Time::get_singleton()->get_ticks_msec();
	RegExContainer reg_container = RegExContainer();
	int cached_maximum_line_length = maximum_line_length;
	maximum_line_length = 10000; // To avoid breaking the tests, only use this for the their larger value.
	ERR_FAIL_COND_V_MSG(!test_array_names(), ERROR_CODE, "Cannot start converting due to problems with data in arrays.");
	ERR_FAIL_COND_V_MSG(!test_conversion(reg_container), ERROR_CODE, "Cannot start converting due to problems with converting arrays.");
	maximum_line_length = cached_maximum_line_length;
	// Checking if folder contains valid Godot 3 project.
	// Project should not be converted more than once.
	{
		String conventer_text = "; Project was converted by built-in tool to Godot 4.0";
		ERR_FAIL_COND_V_MSG(!FileAccess::exists("project.godot"), ERROR_CODE, "Current directory doesn't contains any Godot 3 project");
		Error err = OK;
		String project_godot_content = FileAccess::get_file_as_string("project.godot", &err);
		ERR_FAIL_COND_V_MSG(err != OK, ERROR_CODE, "Failed to read content of \"project.godot\" file.");
		ERR_FAIL_COND_V_MSG(project_godot_content.contains(conventer_text), ERROR_CODE, "Project already was converted with this tool.");