Use phpstan extension installer (#6592)

* Use phpstan extension installer

* Remove not reported errors

composer.json

@@ -75,6 +75,7 @@
         "matthiasnoback/symfony-config-test": "^4.2",
         "matthiasnoback/symfony-dependency-injection-test": "^4.1",
         "phpdocumentor/reflection-docblock": "^5.2",
+        "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "^0.12.29",
         "phpstan/phpstan-symfony": "^0.12.10",
         "psalm/plugin-symfony": "^2.0",

phpstan-baseline.neon

@@ -127,24 +127,6 @@ parameters:
             count: 1
             path: src/Datagrid/ListMapper.php
 
-        -
-            # will be fixed in v4. Currently BC break
-            message: "#^Constructor of class Sonata\\\\AdminBundle\\\\Form\\\\DataTransformer\\\\ModelsToArrayTransformer has an unused parameter \\$choiceList\\.$#"
-            count: 1
-            path: src/Form/DataTransformer/ModelsToArrayTransformer.php
-
-        -
-            # will be fixed in v4. Currently BC break
-            message: "#^Constructor of class Sonata\\\\AdminBundle\\\\Form\\\\DataTransformer\\\\ModelsToArrayTransformer has an unused parameter \\$class\\.$#"
-            count: 1
-            path: src/Form/DataTransformer/ModelsToArrayTransformer.php
-
-        -
-            # will be fixed in v4. Currently BC break
-            message: "#^Constructor of class Sonata\\\\AdminBundle\\\\Form\\\\DataTransformer\\\\ModelsToArrayTransformer has an unused parameter \\$modelManager\\.$#"
-            count: 1
-            path: src/Form/DataTransformer/ModelsToArrayTransformer.php
-
         -
             # will be fixed in v4. Currently BC break
             message: "#^Method Sonata\\\\AdminBundle\\\\Admin\\\\AdminInterface\\<object\\>\\:\\:getFormGroups\\(\\) invoked with 1 parameter, 0 required\\.$#"