### 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.
return this->_camelcase_to_underscore().replace(" ", "_").strip_edges();
}
 ::get_with_code_lines() const {
	const Vector<> lines = split("\n");
	 ret;
	for (int i = 0; i < lines.size(); i++) {
		if (i > 0) {
			ret += "\n";
		}
		ret += vformat("%4d | %s", i + 1, lines[i]);
	}
	return ret;
}
int ::get_slice_count( p_splitter) const {
	if (is_empty()) {
		return 0;
	}
	if (p_splitter.is_empty()) {
		return 0;
	}
	int pos = 0;
	int slices = 1;
	while ((pos = find(p_splitter, pos)) >= 0) {
		slices++;
		pos += p_splitter.length();
	}
	return slices;
}
 ::get_slice( p_splitter, int p_slice) const {