Report resolution ambiguity on '+=' by taking into account full resolution result including post type checking for '+'

^KT-45503 Fixed

compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnVarAndCollections.kt

@@ -0,0 +1,31 @@
+// WITH_RUNTIME
+
+fun test1() {
+    var list = ArrayList<Int>()
+    list -= 2
+}
+
+fun test2() {
+    var set = HashMap<Int, Int>()
+    set += 2 to 2
+}
+
+fun test3() {
+    var set = HashSet<Int>()
+    set -= 2
+}
+
+fun test4() {
+    var list = mutableListOf(1)
+    list += 2
+}
+
+fun test5() {
+    var map = mutableMapOf(1 to 1)
+    map += 2 to 2
+}
+
+fun test6() {
+    var set = mutableSetOf(1)
+    set += 2
+}