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/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();
+    }
+}