[Composer] Fixed failing integration tests

For more details see #247 and ezsystems/ezplatform-kernel#387

Key changes:

* [Composer] Added league/flysystem-memory and sorted packages (needed for Kernel-based integration tests)

* Installed symfony/proxy-manager-bridge

* Disabled process timeout when running integration tests

composer.json

@@ -25,12 +25,14 @@
     },
     "require-dev": {
         "ezsystems/doctrine-dbal-schema": "^1.0@dev",
-        "phpunit/phpunit": "^8.2",
-        "matthiasnoback/symfony-dependency-injection-test": "^4.1",
         "ezsystems/ezplatform-code-style": "^0.1.0",
+        "league/flysystem-memory": "^1.0",
+        "matthiasnoback/symfony-dependency-injection-test": "^4.1",
         "phpstan/phpstan": "^1.8",
         "phpstan/phpstan-phpunit": "^1.1",
-        "phpstan/phpstan-symfony": "^1.2"
+        "phpstan/phpstan-symfony": "^1.2",
+        "phpunit/phpunit": "^8.2",
+        "symfony/proxy-manager-bridge": "^5.4"
     },
     "autoload": {
         "psr-4": {
@@ -51,7 +53,10 @@
     },
     "scripts": {
         "test": "phpunit --bootstrap tests/bootstrap.php -c phpunit.xml",
-        "test-integration-solr": "phpunit --bootstrap tests/bootstrap.php -c vendor/ezsystems/ezplatform-kernel/phpunit-integration-legacy-solr.xml",
+        "test-integration-solr": [
+            "Composer\\Config::disableProcessTimeout",
+            "phpunit --bootstrap tests/bootstrap.php -c vendor/ezsystems/ezplatform-kernel/phpunit-integration-legacy-solr.xml"
+        ],
         "fix-cs": "php-cs-fixer fix -v --show-progress=estimating",
         "check-cs": "php-cs-fixer fix --dry-run -v --show-progress=estimating",
         "phpstan": "phpstan analyse"