Removed unused imports narrowed down via composer-unused tool (#47)

For more details see #47

composer.json

@@ -6,30 +6,16 @@
     "replace": {
         "ezsystems/ez-support-tools": "*"
     },
-    "authors": [
-        {
-            "name": "eZ Systems",
-            "email": "dev-team@ibexa.co"
-        }
-    ],
     "require": {
         "php": "^7.4 || ^8.0",
         "ext-json": "*",
         "ibexa/core": "~4.6.0@dev",
         "ibexa/admin-ui": "~4.6.0@dev",
-        "ocramius/proxy-manager": "^2.2",
-        "symfony/proxy-manager-bridge": "^5.0",
         "zetacomponents/system-information": "^1.1.1"
     },
     "require-dev": {
         "ibexa/ci-scripts": "^0.2@dev",
         "ibexa/code-style": "^1.0",
-        "ezsystems/ezplatform-content-forms": "^1.3@dev",
-        "ezsystems/ezplatform-http-cache": "^2.3@dev",
-        "ezsystems/ezplatform-rest": "^1.3@dev",
-        "ezsystems/ezplatform-richtext": "^2.3@dev",
-        "ezsystems/ezplatform-search": "^1.2@dev",
-        "ezsystems/ezplatform-user": "^2.3@dev",
         "friendsofphp/php-cs-fixer": "^3.0",
         "ibexa/doctrine-schema": "~4.6.0@dev",
         "ibexa/content-forms": "~4.6.0@dev",
@@ -66,5 +52,8 @@
         "fix-cs": "php-cs-fixer fix --config=.php-cs-fixer.php -v --show-progress=dots",
         "check-cs": "@fix-cs --dry-run",
         "test": "phpunit -c phpunit.xml"
+    },
+    "config": {
+        "allow-plugins": false
     }
 }