DX: Add script for running Composer Require Checker (#7252)

composer.json

@@ -98,15 +98,17 @@
         "quality-assurance": [
             "Composer\\Config::disableProcessTimeout",
             "@install-tools --quiet",
-            "@normalize",
             "@self-check",
             "@sa",
             "@test"
         ],
+        "require-checker": "@php dev-tools/vendor/bin/composer-require-checker check composer.json --config-file .composer-require-checker.json",
         "sa": "@static-analysis",
         "self-check": [
             "./dev-tools/check_file_permissions.sh",
-            "./dev-tools/check_trailing_spaces.sh"
+            "./dev-tools/check_trailing_spaces.sh",
+            "@normalize",
+            "@require-checker"
         ],
         "static-analysis": [
             "@cs:check",
@@ -135,6 +137,7 @@
         "post-autoload-dump": "Run additional tasks after installing/updating main dependencies",
         "qa": "Alias for 'quality-assurance'",
         "quality-assurance": "Run QA suite",
+        "require-checker": "Verifies if codebase does not contain soft dependencies",
         "sa": "Alias for 'static-analysis'",
         "self-check": "Run set of self-checks ensuring repository's validity",
         "static-analysis": "Run static analysis",