[CodeQuality] Mirror comment on InlineConstructorDefaultToPropertyRector

[samsonasik]

Fixes rectorphp/rector#9273

Note:

On multiple props on single property definitions:

/**
 * some existing comment
 */
private $thing1, $thing2, $thing3;

public function __construct()
{
        // first
        $this->thing1 = 1;
        // second
        $this->thing2 = 2;
        // third
        $this->thing3 = 3;
}

The multiple comments will be merged as is:

    /**
     * some existing comment
     */
+    // first
+    // second
+    // third
private $thing1, $thing2, $thing3;

then, phpdoc info will require rebuild by set it to null.I add $mergeExistingComments flag that set to false on mirrorComments method on AbstractRector to avoid regression on other existing rules.

[samsonasik]

Fixed 🎉 /cc @calebdw

[samsonasik]

All checks have passed 🎉 @TomasVotruba I am merging it to have faster feedback to test ;)