Kapt: remove old JVM backend test data (1/2)

In this commit, .txt expectation test data files for the old JVM backend
are deleted.

 #KT-64680

plugins/kapt3/kapt3-compiler/testData/kotlinRunner/NestedClasses.it.txt

@@ -1,63 +0,0 @@
-package error;
-
-public final class NonExistentClass {
-}
-
-////////////////////
-
-package test;
-
-@java.lang.annotation.Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME)
-@kotlin.Metadata()
-public abstract @interface MyAnnotation {
-}
-
-////////////////////
-
-package test;
-
-@kotlin.Metadata()
-public final class Simple {
-    @org.jetbrains.annotations.NotNull()
-    public static final test.Simple.Companion Companion = null;
-
-    public Simple() {
-        super();
-    }
-
-    @MyAnnotation()
-    public final void myMethod() {
-    }
-
-    @kotlin.Metadata()
-    public static final class NestedClass {
-
-        public NestedClass() {
-            super();
-        }
-
-        @kotlin.Metadata()
-        public static final class NestedNestedClass {
-
-            public NestedNestedClass() {
-                super();
-            }
-        }
-    }
-
-    @kotlin.Metadata()
-    public final class InnerClass {
-
-        public InnerClass() {
-            super();
-        }
-    }
-
-    @kotlin.Metadata()
-    public static final class Companion {
-
-        private Companion() {
-            super();
-        }
-    }
-}