[IC] Add tests for sealed classes (KT-45474)

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/A.kt

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+package test
+
+interface A : Base

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/B.kt

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+package test
+
+interface B : Base

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/Base.kt

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+package test
+
+sealed interface Base

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/Base.kt.new

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+package test
+
+sealed interface Base {
+
+    fun doSmth() = "doSmth"
+
+}

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/Usage.kt

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+package test
+
+//sealed interface Base
+
+class Usage {
+
+    fun doSmth(x: Base) =
+        when (x) {
+            is A -> "A"
+            is B -> "B"
+        }
+}

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/args.txt

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+-XXLanguage:+FreedomForSealedClasses -XXLanguage:+SealedInterfaces

jps/jps-plugin/testData/incremental/pureKotlin/sealedClassesWhenExpression/build.log

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+================ Step #1 =================
+
+Compiling files:
+    src/Base.kt
+End of files
+Marked as dirty by Kotlin:
+  src/A.kt
+  src/B.kt
+  src/Base.kt
+  src/Usage.kt
+Exit code: ADDITIONAL_PASS_REQUIRED
+------------------------------------------
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/test/A.class
+  out/production/module/test/B.class
+  out/production/module/test/Base.class
+End of files
+Compiling files:
+  src/A.kt
+  src/B.kt
+  src/Base.kt
+End of files
+Exit code: OK
+------------------------------------------