Debugger: Add test for KT-14869

idea/jvm-debugger/jvm-debugger-test/testData/stepping/stepOver/kt14869.kt

@@ -0,0 +1,14 @@
+package test
+
+fun main(args: Array<String>) {
+    foo().let {
+        it
+    }
+}
+
+fun foo(): Int {
+    //Breakpoint!
+    return 1
+}
+
+// STEP_OVER: 3

idea/jvm-debugger/jvm-debugger-test/testData/stepping/stepOver/kt14869.out

@@ -0,0 +1,9 @@
+LineBreakpoint created at kt14869.kt:11
+Run Java
+Connected to the target VM
+kt14869.kt:11
+kt14869.kt:4
+kt14869.kt:7
+Disconnected from the target VM
+
+Process finished with exit code 0