[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/resolve/specialConstructions/reportTypeMismatchDeeplyOnBranches.kt

@@ -8,15 +8,15 @@ fun test(a: Int?, b: Int?) {
 }
 
 fun test(a: Int?, b: Int?, c: Int?) {
-    bar(<!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH!>if (a == null) return else if (b == null) return else <!OI;TYPE_MISMATCH!>c<!><!>)
+    bar(<!NI;TYPE_MISMATCH!>if (a == null) return else if (b == null) return else <!OI;TYPE_MISMATCH!>c<!><!>)
 }
 
 fun test(a: Any?, b: Any?, c: Int?) {
-    bar(<!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH!>if (a == null) if (b == null) <!OI;TYPE_MISMATCH!>c<!> else return else return<!>)
+    bar(<!NI;TYPE_MISMATCH!>if (a == null) if (b == null) <!OI;TYPE_MISMATCH!>c<!> else return else return<!>)
 }
 
 fun test(a: Int?, b: Any?, c: Int?) {
-    bar(<!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH!>if (a == null) {
+    bar(<!NI;TYPE_MISMATCH!>if (a == null) {
         return
     } else {
         if (b == null) {