Upgrade symplify/easy-coding-standard package to 12.2

- rule files restructured to fit the new version
- ECS is now being run only in the main code base
- source: shopsys/shopsys#3192

Author: machacjan

.github/workflows/run-checks-tests.yaml

@@ -25,9 +25,5 @@ jobs:
                     tools: composer
             -   name: Install Composer dependencies
                 run: composer update --optimize-autoloader --no-interaction ${{ matrix.composer-preferred-dependencies }}
-            -   name: Run parallel-lint
-                run: php vendor/bin/parallel-lint ./src ./tests
-            -   name: Run Easy Coding Standards
-                run: php vendor/bin/ecs check --verbose ./src ./tests
             -   name: Run PHPUnit
                 run: php vendor/bin/phpunit tests

composer.json

@@ -35,16 +35,7 @@
         "symfony/routing": "^3.4|^4.0|^5.0",
         "doctrine/annotations": "^1.10.4"
     },
-    "require-dev": {
-        "shopsys/coding-standards": "14.5.x-dev",
-        "php-parallel-lint/php-parallel-lint": "^1.3.1"
-    },
     "conflict": {
         "symfony/dependency-injection": "3.4.15 || 3.4.16"
-    },
-    "config": {
-        "allow-plugins": {
-            "dealerdirect/phpcodesniffer-composer-installer": true
-        }
     }
 }