[FIR] Fix type arguments and substitution for flexible types

compiler/fir/analysis-tests/testData/resolveWithStdlib/inference/flexibleTypeInSystem.kt

@@ -0,0 +1,17 @@
+// ISSUE: KT-37623
+// FULL_JDK
+// FILE: JavaEnum.java
+
+public enum JavaEnum {
+    A;
+}
+
+// FILE: main.kt
+
+import java.util.EnumMap
+
+val enumMap = EnumMap(
+    mapOf(
+        JavaEnum.A to "A"
+    )
+)

compiler/fir/analysis-tests/testData/resolveWithStdlib/inference/flexibleTypeInSystem.txt

@@ -0,0 +1,3 @@
+FILE: main.kt
+    public final val enumMap: R|java/util/EnumMap<ft<JavaEnum, JavaEnum?>!, ft<kotlin/String, kotlin/String?>!>| = R|java/util/EnumMap.EnumMap|<R|ft<JavaEnum, JavaEnum?>!|, R|ft<kotlin/String, kotlin/String?>!|>(R|kotlin/collections/mapOf|<R|ft<JavaEnum, JavaEnum?>!|, R|kotlin/String|>(Q|JavaEnum|.R|/JavaEnum.A|.R|kotlin/to|<R|JavaEnum|, R|kotlin/String|>(String(A))))
+        public get(): R|java/util/EnumMap<ft<JavaEnum, JavaEnum?>!, ft<kotlin/String, kotlin/String?>!>|