### 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.
} else {
		//
		 src_begin = src.get_slicec('/', 0);
		 dst_begin = dst.get_slicec('/', 0);
		if (src_begin != dst_begin) {
			return p_path; //
		}
		src = src.substr(src_begin.length(), src.length());
		dst = dst.substr(dst_begin.length(), dst.length());
	}
	//
	Vector<> src_dirs = src.substr(1, src.length() - 2).split("/");
	Vector<> dst_dirs = dst.substr(1, dst.length() - 2).split("/");
	//
	int common_parent = 0;
	while (true) {
		if (src_dirs.size() == common_parent) {
			break;
		}
		if (dst_dirs.size() == common_parent) {
			break;
		}
		if (src_dirs[common_parent] != dst_dirs[common_parent]) {
			break;
		}
		common_parent++;
	}
	common_parent--;
	int dirs_to_backtrack = (src_dirs.size() - 1) - common_parent;
	 dir = ("../").repeat(dirs_to_backtrack);