EA-37910 - UOE: DescriptorUtils.getSubstitution

The corresponding method reworked to be less of a hack
Tests added

compiler/testData/diagnostics/tests/substitutions/upperBoundsSubstitutionForOverloadResolutionWithAmbiguity.kt

@@ -0,0 +1,14 @@
+// FILE: foo.kt
+package foo
+
+fun f<T>(<!UNUSED_PARAMETER!>l<!>: List<T>) {}
+
+// FILE: main.kt
+
+import foo.*
+
+fun f<T>(<!UNUSED_PARAMETER!>l<!>: List<T>) {}
+
+fun test<T>(l: List<T>) {
+    <!OVERLOAD_RESOLUTION_AMBIGUITY!>f(l)<!>
+}

compiler/testData/diagnostics/tests/substitutions/upperBoundsSubstitutionForOverloadResolutionWithErrorTypes.kt

@@ -0,0 +1,7 @@
+fun f1<T>(<!UNUSED_PARAMETER!>l<!>: <!UNRESOLVED_REFERENCE!>List1<!><T>): T {throw Exception()} // ERROR type here
+fun f1<T>(<!UNUSED_PARAMETER!>l<!>: <!UNRESOLVED_REFERENCE!>List2<!><T>): T {throw Exception()} // ERROR type here
+fun f1<T>(<!UNUSED_PARAMETER!>c<!>: Collection<T>): T{throw Exception()}
+
+fun test<T>(l: List<T>) {
+    f1(l)
+}