[java-dfa] Tests: remove addJetBrainsNotNullByDefault

Unnecessary, as we bumped jetbrains-annotation version (see fcc63bf20b9ce20640d8484fadd820bf39a0a27e [java-dfa] IDEA-375755 Suggest adding Nullable annotation when we are under NotNull scope Tagir Valeev), so it's available by default

GitOrigin-RevId: 158b4e0697b4c408915b947be850d3db1aaa1b7c

java/java-tests/testSrc/com/intellij/java/codeInspection/DataFlowInspection21Test.java

@@ -142,7 +142,6 @@ public class DataFlowInspection21Test extends DataFlowInspectionTestCase {
   public void testSwitchBooleanWhen() { doTest(); }
 
   public void testJetBrainsNotNullByDefault() {
-    addJetBrainsNotNullByDefault(myFixture);
     doTest();
   }
   

java/java-tests/testSrc/com/intellij/java/codeInspection/DataFlowInspectionTestCase.java

@@ -48,16 +48,6 @@ public abstract class DataFlowInspectionTestCase extends LightJavaCodeInsightFix
                      "}");
   }
 
-  static void addJetBrainsNotNullByDefault(JavaCodeInsightTestFixture fixture) {
-    fixture.addClass("""
-                         package org.jetbrains.annotations;
-                         
-                         import java.lang.annotation.*;
-                         
-                         @Target({ElementType.TYPE, ElementType.PACKAGE})\s
-                         public @interface NotNullByDefault {}""");
-  }
-
   static void addJSpecifyNullMarked(JavaCodeInsightTestFixture fixture) {
     @Language("JAVA") String nullMarked =
       """

java/java-tests/testSrc/com/intellij/java/codeInspection/NullableStuffInspectionTest.java

@@ -449,12 +449,10 @@ public class NullableStuffInspectionTest extends LightJavaCodeInsightFixtureTest
   }
 
   public void testParameterUnderDefaultNotNull() {
-    DataFlowInspectionTestCase.addJetBrainsNotNullByDefault(myFixture);
     doTest();
   }
   
   public void testRedundantNotNull() {
-    DataFlowInspectionTestCase.addJetBrainsNotNullByDefault(myFixture);
     doTest();
   }