Analysis API: Fix issues related to implicit invoke calls:

- Correctly set explicit receiver value.
- Restore original function call from FirImplicitFunctionCall (i.e.,
calls implicitly resolved to `invoke`) to get the correct name for
getting all candidates.
- Collect candidates at all tower levels.

Also make order of candidate calls in tests deterministic.

analysis/analysis-api/testData/components/callResolver/resolveCall/ambiguousImplicitInvoke.kt

@@ -0,0 +1,7 @@
+fun x(c: Char) {}
+
+fun call(x: kotlin.Int) {
+    operator fun Int.invoke(a: String) {}
+    operator fun Int.invoke(b: Boolean) {}
+    <expr>x()</expr>
+}