[NI] Do not avoid trivial constraints if they aren't from upper bounds

Since we skipped trivial constraint with `Any?` from parameter type of
 function `equals`, the compiler thought that there is no proper
 constraints (upper bounds do not matter here) and marked resolved
 call as a failed one, then diagnostic about missing equals was added

 Also, tune `TrivialConstraintTypeInferenceOracle` for `Any?`-like
 constraints

 #KT-30724 Fixed

compiler/testData/diagnostics/tests/when/kt9972.kt

@@ -1,6 +1,6 @@
 // !WITH_NEW_INFERENCE
 fun test1(): Int {
-    val x: String = <!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH, NI;TYPE_MISMATCH, NI;TYPE_MISMATCH!>if (true) {
+    val x: String = <!NI;TYPE_MISMATCH!>if (true) {
         when {
             true -> <!OI;TYPE_MISMATCH!>Any()<!>
             else -> <!OI;NULL_FOR_NONNULL_TYPE!>null<!>
@@ -10,7 +10,7 @@ fun test1(): Int {
 }
 
 fun test2(): Int {
-    val x: String = <!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH!>when {
+    val x: String = <!NI;TYPE_MISMATCH!>when {
                         true -> <!OI;TYPE_MISMATCH!>Any()<!>
                         else -> null
                     } ?: return 0<!>