Add dummy files to fix gradle incremental tests

Gradle won't call kotlin task if source directory is empty

KT-8487

jps-plugin/testData/incremental/withJava/convertBetweenJavaAndKotlin/javaToKotlinAndRemove/build.log

@@ -6,6 +6,15 @@ End of files
 Compiling files:
   src/TheClass.kt
 End of files
+Exit code: ADDITIONAL_PASS_REQUIRED
+------------------------------------------
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/other/OtherKt.class
+End of files
+Compiling files:
+  src/other.kt
+End of files
 Exit code: OK
 ------------------------------------------
 
@@ -16,5 +25,14 @@ Cleaning output files:
 End of files
 Compiling files:
 End of files
+Exit code: ADDITIONAL_PASS_REQUIRED
+------------------------------------------
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/other/OtherKt.class
+End of files
+Compiling files:
+  src/other.kt
+End of files
 Exit code: OK
 ------------------------------------------

jps-plugin/testData/incremental/withJava/convertBetweenJavaAndKotlin/javaToKotlinAndRemove/experimental-ic-build.log

@@ -0,0 +1,20 @@
+================ Step #1 =================
+
+Cleaning output files:
+  out/production/module/TheClass.class
+End of files
+Compiling files:
+  src/TheClass.kt
+End of files
+Exit code: OK
+------------------------------------------
+
+================ Step #2 =================
+
+Cleaning output files:
+  out/production/module/TheClass.class
+End of files
+Compiling files:
+End of files
+Exit code: OK
+------------------------------------------

jps-plugin/testData/incremental/withJava/convertBetweenJavaAndKotlin/javaToKotlinAndRemove/other.kt

@@ -0,0 +1,3 @@
+package other
+
+fun other() {}