Redundant Unit inspection: fix false positive for single expression

So #KT-22097 Fixed

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterClass.kt

@@ -0,0 +1,5 @@
+fun test(b: Boolean): Unit = if (b) {
+    class A
+    <caret>Unit
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterClass.kt.after

@@ -0,0 +1,4 @@
+fun test(b: Boolean): Unit = if (b) {
+    class A
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterConstant.kt

@@ -0,0 +1,6 @@
+// PROBLEM: none
+fun test(b: Boolean): Unit = if (b) {
+    1
+    <caret>Unit
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterFunInIf.kt

@@ -0,0 +1,6 @@
+// PROBLEM: none
+fun test(b: Boolean): Unit = if (b) {
+    fun a() = 1
+    <caret>Unit
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterFunInTry.kt

@@ -0,0 +1,5 @@
+fun test(b: Boolean): Unit = try {
+    fun a() {}
+    <caret>Unit
+} catch (e: Exception) {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterFunInTry.kt.after

@@ -0,0 +1,4 @@
+fun test(b: Boolean): Unit = try {
+    fun a() {}
+} catch (e: Exception) {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterFunInWhen.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+fun test(b: Boolean): Unit = when (b) {
+    true -> {
+        fun a() {}
+        <caret>Unit
+    }
+    else -> {
+    }
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterIntFunctionCall.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+fun test(b: Boolean): Unit = if (b) {
+    int()
+    <caret>Unit
+} else {
+}
+
+fun int() = 1

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterUnit.kt

@@ -0,0 +1,5 @@
+fun test(b: Boolean): Unit = if (b) {
+    Unit
+    <caret>Unit
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterUnit.kt.after

@@ -0,0 +1,4 @@
+fun test(b: Boolean): Unit = if (b) {
+    Unit
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterUnitFunctionCall.kt

@@ -0,0 +1,8 @@
+fun test(b: Boolean): Unit = if (b) {
+    unit()
+    <caret>Unit
+} else {
+}
+
+fun unit() {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterUnitFunctionCall.kt.after

@@ -0,0 +1,7 @@
+fun test(b: Boolean): Unit = if (b) {
+    unit()
+} else {
+}
+
+fun unit() {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterVal.kt

@@ -0,0 +1,5 @@
+fun test(b: Boolean): Unit = if (b) {
+    val a = 1
+    <caret>Unit
+} else {
+}

idea/testData/inspectionsLocal/redundantUnitExpression/atLastAfterVal.kt.after

@@ -0,0 +1,4 @@
+fun test(b: Boolean): Unit = if (b) {
+    val a = 1
+} else {
+}