CS/QA: import all used classes

This is a remnant from when PHPCS 2.x was still supported.

Includes adding a missing `@since` tag.

PHPCSUtils/TestUtils/UtilityMethodTestCase.php

@@ -10,8 +10,11 @@
 
 namespace PHPCSUtils\TestUtils;
 
+use PHP_CodeSniffer\Config;
 use PHP_CodeSniffer\Exceptions\TokenizerException;
+use PHP_CodeSniffer\Files\DummyFile;
 use PHP_CodeSniffer\Files\File;
+use PHP_CodeSniffer\Ruleset;
 use PHPCSUtils\BackCompat\Helper;
 use PHPCSUtils\Exceptions\TestFileNotFound;
 use PHPCSUtils\Exceptions\TestMarkerNotFound;
@@ -220,7 +223,7 @@ public static function setUpTestFile()
         self::setStaticConfigProperty('configData', ['report_width' => 80]);
         self::setStaticConfigProperty('configDataFile', '');
 
-        $config = new \PHP_CodeSniffer\Config();
+        $config = new Config();
 
         /*
          * Set to a usable value to circumvent Config trying to find a phpcs.xml config file.
@@ -243,12 +246,12 @@ public static function setUpTestFile()
         // Also set a tab-width to enable testing tab-replaced vs `orig_content`.
         $config->tabWidth = static::$tabWidth;
 
-        $ruleset = new \PHP_CodeSniffer\Ruleset($config);
+        $ruleset = new Ruleset($config);
 
         // Make sure the file gets parsed correctly based on the file type.
         $contents = 'phpcs_input_file: ' . $caseFile . \PHP_EOL . $contents;
 
-        self::$phpcsFile = new \PHP_CodeSniffer\Files\DummyFile($contents, $ruleset, $config);
+        self::$phpcsFile = new DummyFile($contents, $ruleset, $config);
 
         // Only tokenize the file, do not process it.
         try {
@@ -322,6 +325,8 @@ public static function resetTestFile()
     /**
      * Helper function to set the value of a private static property on the PHPCS Config class.
      *
+     * @since 1.0.9
+     *
      * @param string $name  The name of the property to set.
      * @param mixed  $value The value to set the property to.
      *