### 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.
}
 ::strip_escapes() const {
	 new_string;
	for (int i = 0; i < length(); i++) {
		// 
		if (operator[](i) < 32) {
			continue;
		}
		new_string += operator[](i);
	}
	return new_string;
}
 ::lstrip(const  &p_chars) const {
	int len = length();
	int beg;
	for (beg = 0; beg < len; beg++) {
		if (p_chars.find_char(get(beg)) == -1) {
			break;
		}
	}
	if (beg == 0) {
		return *this;
	}
	return substr(beg, len - beg);
}
 ::rstrip(const  &p_chars) const {
	int len = length();
	int end;
	for (end = len - 1; end >= 0; end--) {
		if (p_chars.find_char(get(end)) == -1) {