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/converter/errorSuperclass.txt

@@ -1,52 +0,0 @@
-package test;
-
-@java.lang.annotation.Retention(value = java.lang.annotation.RetentionPolicy.RUNTIME)
-/**
- * internal final annotation class test/Anno : kotlin/Annotation {
- *
- *   // signature: <init>()V
- *   public constructor()
- *
- *   // module name: main
- * }
- */
-@kotlin.Metadata()
-public abstract @interface Anno {
-}
-
-////////////////////
-
-package test;
-
-@Anno()
-/**
- * internal final class test/ClassWithParent : kotlin/CharSequence {
- *
- *   // signature: <init>()V
- *   public constructor()
- *
- *   // module name: main
- * }
- */
-@kotlin.Metadata()
-@kotlin.Suppress(names = {"UNRESOLVED_REFERENCE"})
-public final class ClassWithParent implements java.lang.CharSequence {
-
-    public ClassWithParent() {
-        super();
-    }
-
-    @java.lang.Override()
-    public final char charAt(int index) {
-        return '\u0000';
-    }
-
-    public abstract char get(int index);
-
-    public abstract int getLength();
-
-    @java.lang.Override()
-    public final int length() {
-        return 0;
-    }
-}