Improve: add more cases for MoveVariableDeclarationIntoWhen

#KT-30499 Fixed

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inBinaryExpression.kt

@@ -0,0 +1,9 @@
+fun test() = true
+
+fun foo(): Int {
+    val a<caret> = test()
+    return when (a) {
+        true -> 42
+        else -> null
+    } ?: 55
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inBinaryExpression.kt.after

@@ -0,0 +1,8 @@
+fun test() = true
+
+fun foo(): Int {
+    return when (test()) {
+        true -> 42
+        else -> null
+    } ?: 55
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inProperty.kt

@@ -0,0 +1,9 @@
+fun test() = 42
+
+fun foo() {
+    val a<caret> = test()
+    val b = when (a) {
+        1 -> a
+        else -> 24
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inProperty.kt.after

@@ -0,0 +1,8 @@
+fun test() = 42
+
+fun foo() {
+    val b = when (val a = test()) {
+        1 -> a
+        else -> 24
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inReturnExpression.kt

@@ -0,0 +1,9 @@
+fun test() = 42
+
+fun foo(): Int {
+    val a<caret> = test()
+    return when (a) {
+        1 -> a
+        else -> 24
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inReturnExpression.kt.after

@@ -0,0 +1,8 @@
+fun test() = 42
+
+fun foo(): Int {
+    return when (val a = test()) {
+        1 -> a
+        else -> 24
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inUnaryAndProperty.kt

@@ -0,0 +1,9 @@
+fun test() = true
+
+fun foo() {
+    val a<caret> = test()
+    val b = !when (a) {
+        true -> true
+        else -> false
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/inUnaryAndProperty.kt.after

@@ -0,0 +1,8 @@
+fun test() = true
+
+fun foo() {
+    val b = !when (test()) {
+        true -> true
+        else -> false
+    }
+}

idea/testData/inspectionsLocal/moveVariableDeclarationIntoWhen/notApplicableInBinaryExpression.kt

@@ -0,0 +1,10 @@
+// PROBLEM: none
+fun test() = true
+
+fun foo(): Int {
+    val a<caret> = test()
+    return null ?: when (a) {
+        true -> 42
+        else -> 5
+    }
+}