### Godot version

v4.1.stable.official [970459615]

### System information

Windows 11

### Issue description

Using `String::pad_zeros` on a string containing digits with greater length than the argument `digits` raises the error `Parameter count should be a positive number.` of `String::repeat`, because it is called with a negative parameter.
(Actually this error is not 100% correct, it should be non-negative)

4.0 Code:
https://github.com/godotengine/godot/blob/c8e0bd50c57de91c061866db1de407f2e7a74acd/core/string/ustring.cpp#L4127-L4155

Example: `"2023".pad_zeros(2)`
`begin == 0`
`end == 4`
`end - begin < p_digits == false` => No "0" is inserted, the string is returned unchanged.

4.1 Code:
https://github.com/godotengine/godot/blob/ce5c6151fc498b39fe0c188045a4685e0f627854/core/string/ustring.cpp#L4266-L4290

Example: `"2023".pad_zeros(2)`
`begin == 0`
`end == 4`
`zeros_to_add == 2 - (4 - 0) == -2`
=> `s.insert(0, String("0").repeat(-2))` is called => Error.

I don't know why this was changed, but I think ensuring that `zeros_to_add > 0` should be ensured internally and not by the user. If this condition is not fullfilled the string should be returned unchanged as in the 4.0 implementation.

### Steps to reproduce

Try my above mentioned example in 4.0 and 4.1

### Minimal reproduction project

Not necessary.
if (is_finite) {
							number_str = number_str.pad_decimals(min_decimals);
						}
						int initial_len = number_str.length();
						// 
						int pad_chars_count = val < 0 ? min_chars - 1 : min_chars;
						 pad_char = (pad_with_zeros && is_finite) ? ("0") : (" "); // 
						if (left_justified) {
							number_str = number_str.rpad(pad_chars_count, pad_char);
						} else {
							number_str = number_str.lpad(pad_chars_count, pad_char);
						}
						// 
						if (val < 0) {
							if (left_justified) {
								number_str = number_str.insert(0, "-");
							} else {
								number_str = number_str.insert(pad_with_zeros ? 0 : number_str.length() - initial_len, "-");
							}
						}
						// 
						str += number_str;
						if (i < count - 1) {
							str += ", ";
						}
					}
					str += ")";
					formatted += str;
					++value_index;
					in_format = false;