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/enumImports.txt

@@ -0,0 +1,35 @@
+package kapt;
+
+import kotlin.annotation.Repeatable;
+
+/**
+ * public final enum class kapt/Options : kotlin/Enum<kapt/Options> {
+ *
+ *   // signature: <init>(Ljava/lang/String;I)V
+ *   private constructor()
+ *
+ *   A,
+ *
+ *   B,
+ *
+ *   C,
+ *
+ *   // module name: main
+ *
+ *   // has Enum.entries
+ * }
+ */
+@kotlin.Metadata()
+public enum Options {
+    /*public static final*/ A /* = new Options() */,
+    /*public static final*/ B /* = new Options() */,
+    /*public static final*/ C /* = new Options() */;
+
+    Options() {
+    }
+
+    @org.jetbrains.annotations.NotNull()
+    public static kotlin.enums.EnumEntries<kapt.Options> getEntries() {
+        return null;
+    }
+}