UnwrapSwitchLabelFix: when only one switch branch is reachable

Fixes IDEA-200651 Analysis for 'switch' statements may determine always truthy conditions on branches in addition to always falsy
Minor refactoring of reporting in DataFlowInspectionBase

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/deleteSwitchLabel/afterDeleteWhenOtherIsAlwaysTrue.java

@@ -1,12 +1,8 @@
-// "Remove switch label '"two"'" "true"
+// "Unwrap 'switch' statement" "true"
 class Main {
     static void fff() {
-        switch ("one") {
-            case "one":
-                System.out.println("one");
-                // quick-fix removes body as well
-                System.out.println("two");
-        }
+        System.out.println("one");
+        System.out.println("two");
     }
 
     public static void main(String[] args) {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/deleteSwitchLabel/afterUnwrap.java

@@ -0,0 +1,15 @@
+// "Unwrap 'switch' statement" "true"
+class Main {
+    static void fff(int x) {
+        if (x == 5) {
+            System.out.println("five-ten-fifteen"); //5
+            System.out.println("six"); //6
+            System.out.println("seven"); //7
+            //other
+        }
+    }
+
+    public static void main(String[] args) {
+        fff();
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/deleteSwitchLabel/beforeDeleteWhenOtherIsAlwaysTrue.java

@@ -1,10 +1,10 @@
-// "Remove switch label '"two"'" "true"
+// "Unwrap 'switch' statement" "true"
 class Main {
     static void fff() {
         switch ("one") {
-            case "one":
+            case "<caret>one":
                 System.out.println("one");
-            case "<caret>two": // quick-fix removes body as well
+            case "two":
                 System.out.println("two");
         }
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/deleteSwitchLabel/beforeUnwrap.java

@@ -0,0 +1,22 @@
+// "Unwrap 'switch' statement" "true"
+class Main {
+    static void fff(int x) {
+        if (x == 5) {
+            switch (x) {
+                case 1: System.out.println("one"); //1
+                case 2: System.out.println("two"); //2
+                case 3: System.out.println("three"); //3
+                case 4: System.out.println("four"); //4
+                case 0:case <caret>5:case 10: System.out.println("five-ten-fifteen"); //5
+                case 6: System.out.println("six"); //6
+                case 7: System.out.println("seven"); //7
+                    break;
+                default: System.out.println("and more"); //other
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        fff();
+    }
+}