FIR: Support safe-calls new format in body resolution

^KT-38444 In Progress

compiler/fir/analysis-tests/testData/resolve/callResolution/extensionInvokeAfterSafeCall.kt

@@ -0,0 +1,9 @@
+interface A
+
+fun test_1(a: A?, convert: A.() -> String) {
+    val s = a?.convert()
+}
+
+fun test_2(a: A, convert: A.() -> String) {
+    val s = a.convert()
+}