AC-666: Create phpcs static check for CopyrightTest

Author: eliseacornejo

Magento2/Sniffs/Legacy/CopyrightSniff.php

@@ -40,7 +40,7 @@ public function process(File $phpcsFile, $stackPtr)
             if (strpos($contentFile, self::COPYRIGHT_MAGENTO_TEXT) === false || $adobeCopyrightFound === false) {
                 $phpcsFile->addWarningOnLine(
                     'Copyright is missing or has wrong format',
-                    null,
+                    $phpcsFile->getTokens()[$positionComment]['line'],
                     self::WARNING_CODE
                 );
             }

Magento2/Tests/Legacy/CopyrightUnitTest.php

@@ -26,8 +26,17 @@ public function getWarningList($testFile = ''): array
             return [];
         }
 
-        return [
-            null => 1,
-        ];
+        if ($testFile === 'CopyrightUnitTest.1.inc') {
+            return [
+                1 => 1,
+            ];
+        }
+        if ($testFile === 'CopyrightUnitTest.2.inc' || 'CopyrightUnitTest.3.inc') {
+            return [
+                3 => 1,
+            ];
+        }
+
+        return [];
     }
 }