Deprecations for PHP 8.1 get_class() and get_called_class() without argument

Related to -> 4. 780 docroot/core/lib/Drupal/Core/Url.php get_class() without argument.
Example:
If you want to get the class name of the current object, you need to replace the following code:
1. get_class();

$class = get_class();

Should be replaced with

$class = get_class($this);

2. get_called_class();

$class = get_called_class();

Should be Replaced with

$class = get_called_class(self::class);

I have uploaded the patch.
Addressed #3
Please review it.

As It is implies that functionality of code will not be touched:
The changes 1. get_class() -> get_class($this) and 2. get_called_class() -> get_called_class(self::class) are both not equivalent (e.g. see Example2 from https://www.php.net/manual/en/function.get-class.php)
and the changes in the merge request are taken from proposal here https://wiki.php.net/rfc/deprecations_php_8_1

Removing credit for #4 as it's expected to test your path before uploading.

Reviewing MR 3741
Searched for get_class() found 5 instances that were covered
Searched for get_called_class() found 1 that was covered
Searched for get_parent_class and found 0

Looks good

Good work!

Committed/pushed to 10.1.x, cherry-picked to 10.0.x and 9.5.x, thanks!

Automatically closed - issue fixed for 2 weeks with no activity.