Removed copying of non-existing test files (yiisoft#19822)

Tests patches are now loaded via URL (yiisoft#18356).

Author: rhertogh

Dockerfile

@@ -4,10 +4,7 @@ FROM ${DOCKER_YII2_PHP_IMAGE}
 # Project source-code
 WORKDIR /project
 ADD composer.* /project/
-# Apply testing patches
-ADD tests/phpunit_mock_objects.patch /project/tests/phpunit_mock_objects.patch
-ADD tests/phpunit_getopt.patch /project/tests/phpunit_getopt.patch
-# Install packgaes
+# Install packages
 RUN /usr/local/bin/composer install --prefer-dist
 ADD ./ /project
 ENV PATH /project/vendor/bin:${PATH}