K2: don't approximate captured types in ResultTypeResolver in certain cases

To be more precises, ResultTypeResolver for K2 now searches for
similar LOWER/UPPER constraints pair based on the same flexible type,
like LOWER(CapturedType&Any..CapturedType?) and UPPER(CapturedType!).
If such a pair is found, the CapturedType is not approximated.
This is done to avoid a big difference between this case and
completely same constraints, like LOWER(CapturedType!) and
UPPER(CapturedType!). In this case we squash them to EQUAL(CapturedType!)
even before ResultTypeResolver, and captured types which is got from
an EQUAL constraint are not approximated even before this commit.

This commit fixes back a case from KT-50134 and a problem with intellij.vcs.git

#KT-65596 Fixed

compiler/fir/analysis-tests/testData/resolve/inference/javaCollector.kt

@@ -6,12 +6,12 @@ import java.util.stream.Collectors
 
 fun foo(){
     listOf("").stream().collect(
-        <!ARGUMENT_TYPE_MISMATCH, NEW_INFERENCE_ERROR!>Collectors.groupingBy(
+        Collectors.groupingBy(
             { it },
             Collectors.collectingAndThen(
                 Collectors.counting<String>(),
                 Long::toInt
             )
-        )<!>
+        )
     )
 }