[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/overload/defaultParameters.kt

@@ -55,5 +55,5 @@ fun test() {
 
     withGenericDefaults("")
 
-    <!OI;UNREACHABLE_CODE!><!OVERLOAD_RESOLUTION_AMBIGUITY!>wrong<!>(<!>null!!<!OI;UNREACHABLE_CODE!>)<!>
+    <!UNREACHABLE_CODE!><!OVERLOAD_RESOLUTION_AMBIGUITY!>wrong<!>(<!>null!!<!UNREACHABLE_CODE!>)<!>
 }