[PHPStan] Clean up PHPStan ignore errors (#2089)

phpstan.neon

@@ -329,7 +329,6 @@ parameters:
         -
             message: '#foreach\(\), while\(\), for\(\) or if\(\) cannot contain a complex expression\. Extract it to a new variable on a line before#'
             paths:
-                - rules/CodeQuality/Rector/Return_/SimplifyUselessVariableRector.php
                 - rules/Php70/Rector/FuncCall/MultiDirnameRector.php
                 - src/Application/FileProcessor.php
                 - src/PhpParser/Node/BetterNodeFinder.php
@@ -564,9 +563,6 @@ parameters:
 
         - '#foreach\(\), while\(\), for\(\) or if\(\) cannot contain a complex expression\. Extract it to a new variable on a line before#'
 
-        # false positive
-        - '#Method Rector\\Php71\\Rector\\FuncCall\\RemoveExtraParametersRector\:\:resolveMaximumAllowedParameterCount\(\) should return int but returns int<0, max>\|false#'
-
         # double protection on purpose to ensure the type
         -
             message: '#Call to static method Webmozart\\Assert\\Assert\:\:allString\(\) with array<string> will always evaluate to true#'