Squiz/VariableComment: incorrectly flags missing docblock for properties with union/intersection type

[jrfnl]

Describe the bug

When scanning a class containing properties with PHP native union or intersection types, these will always be flagged as not having a docblock even when a docblock is present.

Code sample

class Foo
{
    /**
     * This is fine.
     *
     * @var string|integer
     */
    public $correct_not_missing_docblock_union;

    /**
     * This snippet gets flagged with "Missing member variable doc comment (Squiz.Commenting.VariableComment.Missing)"
     *
     * @var string|integer
     */
    public string|int $BUG_missing_docblock_with_union_type;

    /**
     * This is fine
     *
     * @var InterfaceA&InterfacB
     */
    public $correct_not_missing_docblock_intersection;

    /**
     * This snippet gets flagged with "Missing member variable doc comment (Squiz.Commenting.VariableComment.Missing)"
     *
     * @var InterfaceA&InterfacB
     */
    public InterfaceA&InterfacB $BUG_missing_docblock_intersection;
}

To reproduce

Steps to reproduce the behavior:

1. Create a file called test.php with the code sample above...
2. Run phpcs test.php --standard=squiz --sniffs=squiz.commenting.variablecomment
3. See error message displayed

---------------------------------------------------------------------------------------------
FOUND 2 ERRORS AFFECTING 2 LINES
---------------------------------------------------------------------------------------------
 17 | ERROR | Missing member variable doc comment (Squiz.Commenting.VariableComment.Missing)
 31 | ERROR | Missing member variable doc comment (Squiz.Commenting.VariableComment.Missing)
---------------------------------------------------------------------------------------------

Expected behavior

That the docblocks would be recognized correctly and no "missing docblock" errors would be thrown.

Versions (please complete the following information)

Operating System	not relevant
PHP version	not relevant
PHP_CodeSniffer version	master
Standard	Squiz
Install type	git clone

Additional context

PR squizlabs/PHP_CodeSniffer#3757 may contain a partial fix for this.

Please confirm:

• I have searched the issue list and am not opening a duplicate issue.
• I confirm that this bug is a bug in PHP_CodeSniffer and not in one of the external standards.
• I have verified the issue still exists in the master branch of PHP_CodeSniffer.