Move `PathUtilsTest.kt` to the correct package

Summary:
This file was placed in the wrong package. I'm moving it.

Changelog:
[Internal] [Changed] - Move `PathUtilsTest.kt` to the correct package

Reviewed By: motiz88

Differential Revision: D31168890

fbshipit-source-id: 59d09b5fd329b776bd2800921889281a116c26ee

packages/react-native-gradle-plugin/src/test/kotlin/com/facebook/react/utils/PathUtilsTest.kt

@@ -5,10 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-package com.facebook.react.tests
+package com.facebook.react.utils
 
 import com.facebook.react.TestReactExtension
-import com.facebook.react.utils.*
 import java.io.File
 import org.gradle.testfixtures.ProjectBuilder
 import org.junit.Assert.*