[FIR] Insert SAM conversion expressions during completion

#KT-62847 Fixed

compiler/testData/ir/irText/expressions/sam/samConversions.fir.kt.txt

@@ -0,0 +1,29 @@
+fun J.test0(a: Runnable) {
+  runStatic(r = a)
+  <this>.runIt(r = a)
+}
+
+fun test1() {
+  runStatic(r = local fun <anonymous>() {
+    test1()
+  }
+ /*-> Runnable */)
+}
+
+fun J.test2() {
+  <this>.runIt(r = local fun <anonymous>() {
+    test1()
+  }
+ /*-> Runnable */)
+}
+
+fun J.test3(a: Function0<Unit>) {
+  <this>.run2(r1 = a /*-> Runnable */, r2 = a /*-> Runnable */)
+}
+
+fun J.test4(a: Function0<Unit>, b: Function0<Unit>, flag: Boolean) {
+  <this>.runIt(r = when {
+    flag -> a
+    else -> b
+  } /*-> Runnable */)
+}