K2: repeat K1 representation for flexible type parameters

This commit changes the behavior of KT-59138 effectively declining it in 2.0.
However, we plan to implement KT-59138 behavior under a feature
flag in 2.0 (see KT-66447), and switch this feature on version 2.x.

Also, this commit implements the LC resolution about postponing
KT-57014 change. We don't have KT-57014 described behavior in 2.0 anymore.
However, we plan to implement a deprecation warning here, see KT-65578.

After this commit, 6 diagnostic tests become incorrectly broken:
- 5 tests from PurelyImplementedCollection group
- a test platformTypes/nullableTypeArgument.kt

This commit also breaks currently fixed-in-k2 KT-50134
(it is fixed again in the following commits),
as well as KT-58933 (it will remain not fixed till we enable KT-59138
behavior again).

#KT-65596 In Progress
#KT-57014 In Progress
#KT-58933 Submitted

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

@@ -1,7 +1,7 @@
 FILE: javaCollector.kt
     public final fun foo(): R|kotlin/Unit| {
-        R|kotlin/collections/listOf|<R|kotlin/String|>(String()).R|SubstitutionOverride<kotlin/collections/List.stream: R|@EnhancedNullability java/util/stream/Stream<@EnhancedNullability kotlin/String>|>|().R|SubstitutionOverride<java/util/stream/Stream.collect: R|ft<R & Any, R?>|>|<R|ft<kotlin/collections/MutableMap<kotlin/String!, kotlin/Int!>, kotlin/collections/Map<kotlin/String!, kotlin/Int!>?>|, R|ft<CapturedType(*), CapturedType(*)?>|>(Q|java/util/stream/Collectors|.R|java/util/stream/Collectors.groupingBy*s|<R|kotlin/String!|, R|kotlin/String!|, R|ft<CapturedType(*), CapturedType(*)?>|, R|kotlin/Int!|>(SAM(groupingBy@fun <anonymous>(it: R|@EnhancedNullability kotlin/String!|): R|@EnhancedNullability kotlin/String!| <inline=NoInline>  {
+        R|kotlin/collections/listOf|<R|kotlin/String|>(String()).R|SubstitutionOverride<kotlin/collections/List.stream: R|@EnhancedNullability java/util/stream/Stream<@EnhancedNullability kotlin/String>|>|().R|SubstitutionOverride<java/util/stream/Stream.collect: R|R!|><Inapplicable(INAPPLICABLE): java/util/stream/Stream.collect>#|<<ERROR TYPE REF: Cannot infer argument for type parameter R>, <ERROR TYPE REF: Cannot infer argument for type parameter A>>(Q|java/util/stream/Collectors|.R|java/util/stream/Collectors.groupingBy*s<CS errors: java/util/stream/Collectors.groupingBy>#|<R|kotlin/String!|, <ERROR TYPE REF: Cannot infer argument for type parameter K>, R|kotlin/Any!|, R|kotlin/Int!|>(SAM(groupingBy@fun <anonymous>(it: R|@EnhancedNullability kotlin/String!|): <ERROR TYPE REF: Cannot infer argument for type parameter K> <inline=NoInline>  {
             ^ R|<local>/it|
         }
-        ), Q|java/util/stream/Collectors|.R|java/util/stream/Collectors.collectingAndThen*s|<R|kotlin/String!|, R|ft<CapturedType(*), CapturedType(*)?>|, R|kotlin/Long!|, R|kotlin/Int!|>(Q|java/util/stream/Collectors|.R|java/util/stream/Collectors.counting*s|<R|kotlin/String|>(), SAM(Q|kotlin/Long|::R|kotlin/Long.toInt|))))
+        ), Q|java/util/stream/Collectors|.R|java/util/stream/Collectors.collectingAndThen*s|<R|kotlin/String!|, R|ft<CapturedType(*), CapturedType(*)?>|, R|kotlin/Long!|, R|kotlin/Int!|>(Q|java/util/stream/Collectors|.R|java/util/stream/Collectors.counting*s|<R|kotlin/String!|>(), SAM(Q|kotlin/Long|::R|kotlin/Long.toInt|))))
     }

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

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

compiler/fir/analysis-tests/testData/resolve/inference/onlyInputTypesCapturedTypeWithRecursiveBounds.fir.txt

@@ -41,9 +41,9 @@ FILE: onlyInputTypesCapturedTypeWithRecursiveBounds.kt
 
     }
     private final fun test(node: R|FooEnumMap<*>|): R|kotlin/Unit| {
-        R|<local>/node|.R|SubstitutionOverride</FooEnumMap.data: R|java/util/EnumMap<CapturedType(*), kotlin/Any?>|>|.R|kotlin/collections/get|<R|ft<it(kotlin/Enum<*> & I), it(kotlin/Enum<*>? & I?)>|, R|kotlin/Any!|>(Q|MyEnum|.R|/MyEnum.EnumEntry|)
+        R|<local>/node|.R|SubstitutionOverride</FooEnumMap.data: R|java/util/EnumMap<CapturedType(*), kotlin/Any?>|>|.R|kotlin/collections/get|<R|ft<it(kotlin/Enum<*> & I), it(kotlin/Enum<*>? & I?)>|, R|kotlin/Any?|>(Q|MyEnum|.R|/MyEnum.EnumEntry|)
         lval map: R|java/util/EnumMap<out it(kotlin/Enum<*> & I), kotlin/Any?>| = R|<local>/node|.R|SubstitutionOverride</FooEnumMap.data: R|java/util/EnumMap<CapturedType(*), kotlin/Any?>|>|
-        R|<local>/map|.R|kotlin/collections/get|<R|ft<it(kotlin/Enum<out ft<it(kotlin/Enum<out ft<it(kotlin/Enum<*> & I), it(kotlin/Enum<*>? & I?)>> & I), it(kotlin/Enum<*>? & I?)>> & I), it(kotlin/Enum<*>? & I?)>|, R|kotlin/Any!|>(Q|MyEnum|.R|/MyEnum.EnumEntry|)
+        R|<local>/map|.R|kotlin/collections/get|<R|ft<it(kotlin/Enum<*> & I), it(kotlin/Enum<*>? & I?)>|, R|kotlin/Any?|>(Q|MyEnum|.R|/MyEnum.EnumEntry|)
     }
     public open class Foo2<P : R|I|> : R|kotlin/Any| {
         public constructor<P : R|I|>(data: R|kotlin/collections/Map<P, kotlin/Any?>|): R|Foo2<P>| {

compiler/fir/analysis-tests/testData/resolve/inference/selfTypeFromJava.fir.txt

@@ -1,6 +1,6 @@
 FILE: main.kt
     public final fun main(): R|kotlin/Unit| {
         lval a: R|ft<Java<*, kotlin/String!>, Java<*, kotlin/String!>?>| = Q|Java|.R|/Java.factory*s|<R|kotlin/String!|>(String())
-        lval b: R|ft<Java<*, kotlin/String!>, Java<*, kotlin/String!>?>| = R|<local>/a|.R|SubstitutionOverride</Java.produceSelf: R|ft<CapturedType(*) & Any, CapturedType(*)?>|>|()
+        lval b: R|ft<Java<*, kotlin/String!>, Java<*, kotlin/String!>?>| = R|<local>/a|.R|SubstitutionOverride</Java.produceSelf: R|ft<CapturedType(*), CapturedType(*)?>|>|()
         R|<local>/b|.R|SubstitutionOverride</Java.consumeElement: R|kotlin/Unit|>|(String(testing))
     }