Feature check redeclared readonly properties v2

[schlndh]

This is a relaxed (and reimplemented) version of the rule from: #3041 (comment)

Considering this example: https://phpstan.org/r/cf781e9e-cfdd-4aae-855d-ead64bf16afa - if (a subclass redeclares readonly property in promoted fashion OR assigns the redeclared readonly property) AND calls parent constructor AND parent constructor declares the readonly property in promoted fashion, then we should always report an error. This can be achieved with local analysis only, without performance impact. PHPStan should see that as duplicate assignment with existing rules in place. So MissingReadOnlyPropertyAssignRule should report "is already assigned" just by modifying the data that is fed into it.

Fixes phpstan/phpstan#8101
Fixes phpstan/phpstan#9863
Fixes phpstan/phpstan#9864

[ondrejmirtes]

Awesome job! Thank you.