### 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.
* use `TTRN()` instead of `TTR()`.
 *
 * NOTE: Only use `TTR()` in editor-only code (typically within the `editor/` folder).
 * For translations that can be supplied by exported projects, use `RTR()` instead.
 */
 TTR(const  &p_text, const  &p_context) {
	if (TranslationServer::get_singleton()) {
		return TranslationServer::get_singleton()->tool_translate(p_text, p_context);
	}
	return p_text;
}
/**
 * "Tools TRanslate for N items". Performs string replacement for
 * internationalization within the editor. A translation context can optionally
 * be specified to disambiguate between identical source strings in
 * translations. Use `TTR()` if the string doesn't need dynamic plural form.
 * When placeholders are desired, use
 * `vformat(TTRN("%d item", "%d items", some_integer), some_integer)`.
 * The placeholder must be present in both strings to avoid run-time warnings in `vformat()`.
 *
 * NOTE: Only use `TTRN()` in editor-only code (typically within the `editor/` folder).
 * For translations that can be supplied by exported projects, use `RTRN()` instead.
 */
 TTRN(const  &p_text, const  &p_text_plural, int p_n, const  &p_context) {
	if (TranslationServer::get_singleton()) {
		return TranslationServer::get_singleton()->tool_translate_plural(p_text, p_text_plural, p_n, p_context);
	}
	// 
	if (p_n == 1) {
		return p_text;