[FIR] Create error candidate for completion instead of simple error reference

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

@@ -0,0 +1,19 @@
+fun foo(x: Int) {}
+
+interface A
+interface B
+interface C : A, B
+
+fun bar(x: A) {}
+fun bar(x: B) {}
+
+fun test(c: C) {
+    // Argument mapping error
+    <!INAPPLICABLE_CANDIDATE!>foo<!>("")
+
+    // Ambiguity
+    <!AMBIGUITY!>bar<!>(c)
+
+    // Unresolved reference
+    <!UNRESOLVED_REFERENCE!>baz<!>()
+}