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

In this commit, .ir.txt expectation test data files for the JVM IR
backend are renamed to .txt. This is done as two separate commits so
that Git would recognize that these files were logically moved, not that
the contents of the original .txt files were changed.

 #KT-64680

plugins/kapt3/kapt3-compiler/testData/converter/inheritanceSimple.txt

@@ -0,0 +1,49 @@
+public abstract class BaseClass {
+
+    public BaseClass(@org.jetbrains.annotations.NotNull()
+    Context context, int num, boolean bool) {
+        super();
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public abstract Result doJob();
+}
+
+////////////////////
+
+
+public abstract interface Context {
+}
+
+////////////////////
+
+
+public final class Inheritor extends BaseClass {
+
+    public Inheritor(@org.jetbrains.annotations.NotNull()
+    Context context) {
+        super(null, 0, false);
+    }
+
+    @java.lang.Override()
+    @org.jetbrains.annotations.NotNull()
+    public Result doJob() {
+        return null;
+    }
+}
+
+////////////////////
+
+
+public enum Result {
+    /*public static final*/ SUCCESS /* = new Result() */,
+    /*public static final*/ ERROR /* = new Result() */;
+
+    Result() {
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public static kotlin.enums.EnumEntries<Result> getEntries() {
+        return null;
+    }
+}