### 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.
}
			case READING_INT: {
				if (is_digit(c)) {
					if (integer > INT64_MAX / 10) {
						 number("");
						str = p_str;
						while (*str && str != limit) {
							number += *(str++);
						}
						if (p_clamp) {
							if (sign == 1) {
								return INT64_MAX;
							} else {
								return INT64_MIN;
							}
						} else {
							ERR_FAIL_V_MSG(sign == 1 ? INT64_MAX : INT64_MIN, "Cannot represent " + number + " as a 64-bit signed integer, since the value is " + (sign == 1 ? "too large." : "too small."));
						}
					}
					integer *= 10;
					integer += c - '0';
				} else {
					reading = READING_DONE;
				}
			} break;
		}
	}
	return sign * integer;
}
double ::to_float() const {