IDEA-325556 [Platform|TestFramework] fix: use getExpectedStringPresentation instead of getExpected where we expect text

The return type of `FileComparisonData.getExpected` is `Object`. In `Opentest4j` scenario, it can be FileInfo. So we need to use `FileComparisonData.getExpectedStringPresentation` instead.

GitOrigin-RevId: c32aaf1674072c3c21ccaf447c9d50296a9e38e3

java/java-runtime/src/com/intellij/rt/execution/junit/ComparisonFailureData.java

@@ -230,8 +230,8 @@ public class ComparisonFailureData {
   private static ComparisonFailureData createFileComparisonFailure(Throwable assertion) {
     if (assertion instanceof FileComparisonFailure) {
       final FileComparisonFailure comparisonFailure = (FileComparisonFailure)assertion;
-      String actual = comparisonFailure.getActual();
-      String expected = comparisonFailure.getExpected();
+      String actual = comparisonFailure.getActualStringPresentation();
+      String expected = comparisonFailure.getExpectedStringPresentation();
       if (actual != null && expected != null) {
         return new ComparisonFailureData(expected, actual, comparisonFailure.getFilePath(), comparisonFailure.getActualFilePath());
       }

java/java-runtime/src/com/intellij/rt/execution/junit/FileComparisonData.java

@@ -2,9 +2,7 @@
 package com.intellij.rt.execution.junit;
 
 public interface FileComparisonData {
-  Object getActual();
   String getActualStringPresentation();
-  Object getExpected();
   String getExpectedStringPresentation();
   String getFilePath();
   String getActualFilePath();

java/java-runtime/src/com/intellij/rt/execution/junit/FileComparisonFailure.java

@@ -40,16 +40,6 @@ public class FileComparisonFailure extends ComparisonFailure implements FileComp
     return myActualFilePath;
   }
   
-  @Override
-  public String getExpected() {
-    return myExpected;
-  }
-
-  @Override
-  public String getActual() {
-    return myActual;
-  }
-
   @Override
   public String getActualStringPresentation() {
     return myActual;