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/multifileClassDefaultPackage.txt

@@ -1,64 +0,0 @@
-/**
- * public final class AnotherRootClass : kotlin/Any {
- *
- *   // signature: <init>()V
- *   public constructor()
- *
- *   // module name: main
- * }
- */
-@kotlin.Metadata()
-public final class AnotherRootClass {
-
-    public AnotherRootClass() {
-        super();
-    }
-}
-
-////////////////////
-
-
-/**
- * public final class RootClass : kotlin/Any {
- *
- *   // signature: <init>()V
- *   public constructor()
- *
- *   // module name: main
- * }
- */
-@kotlin.Metadata()
-public final class RootClass {
-
-    public RootClass() {
-        super();
-    }
-}
-
-////////////////////
-
-package test;
-
-/**
- * multi-file class {
- *   // test/M1__BKt
- *   // test/M1__CKt
- * }
- */
-@kotlin.Metadata()
-public final class M1 {
-
-    public M1() {
-        super();
-    }
-
-    @org.jetbrains.annotations.Nullable()
-    public static final RootClass foo() {
-        return null;
-    }
-
-    @org.jetbrains.annotations.Nullable()
-    public static final AnotherRootClass bar() {
-        return null;
-    }
-}