IJPL-223744 whats-new: fix the resource search path for test

Otherwise, the test depends on the product and product flavor (EAP or release) of the base product in its classpath.

#IJPL-223744 Fixed

GitOrigin-RevId: bf2ad31d0c1b2b703e0dc6777fb8a6d62cd9d7b6

Author: ForNeVeR

platform/whatsNew/testSrc/com/intellij/platform/whatsNew/WhatsNewVisionContentProviderTest.kt

@@ -12,6 +12,7 @@ class WhatsNewVisionContentProviderTest {
   @Test
   fun testLegacyResourceNaming() {
     val provider = object : WhatsNewInVisionContentProvider() {
+      override val baseResourcePathInClassLoader = "com/intellij/platform/whatsNew/idea/eap"
       fun extractResourceNames() = getVisionJsonResourceNames()
     }