Move variable declaration into when: don't report when property has 'return' or 'throw'

#KT-31999 Fixed

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/hasReturn.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+fun test(str: String?): String? {
+    val <caret>some = str ?: return null
+    return when (some) {
+        "some" -> some
+        else -> ""
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/hasReturn2.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+fun test(str: String?): String? {
+    val <caret>some = if (str != null) str + str else return null
+    return when (some) {
+        "some" -> some
+        else -> ""
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/hasThrow.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+fun test(str: String?): String? {
+    val <caret>some = str ?: throw Exception()
+    return when (some) {
+        "some" -> some
+        else -> ""
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/hasThrow2.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+fun test(str: String?): String? {
+    val <caret>some = if (str != null) str + str else throw Exception()
+    return when (some) {
+        "some" -> some
+        else -> ""
+    }
+}