[11.x] Using the ?? Operator (Null Coalescing Operator)

[saMahmoudzadeh]

This PR, introduces the use of the Null Coalescing Operator (??) in the some cases. The Null Coalescing Operator is a concise and effective way to handle null values, providing a default value if the variable is null.

Laravel 11 supports PHP 8.2 and higher, and the ?? operator has been available since PHP 7 and above. Therefore, we have no issues in terms of compatibility with the changes. The goal of these changes is to simplify the code and utilize the powerful features of PHP.

example:

// before
if (isset($this->dispatchAfterCommit)) {
    return $this->dispatchAfterCommit;
}

return false;

// after
return $this->dispatchAfterCommit ?? false;