[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/dataFlowInfoTraversal/BinaryExpression.kt

@@ -6,6 +6,6 @@ fun foo() {
     val x: Int? = null
 
     bar(1 + (if (x == null) 0 else x))
-    bar(<!NI;TYPE_MISMATCH!>if (x == null) <!DEBUG_INFO_CONSTANT, NI;TYPE_MISMATCH, NI;TYPE_MISMATCH, OI;TYPE_MISMATCH!>x<!> else x<!>)
+    bar(<!NI;TYPE_MISMATCH!>if (x == null) <!DEBUG_INFO_CONSTANT, OI;TYPE_MISMATCH!>x<!> else x<!>)
     if (x != null) bar(x + x/(x-x*x))
 }