i18n fix: traverse to the expression top level (IDEA-248707)

if one need to extract subpart of concatenation, it's required to extract a variable; similar to parts of polyadic expression

GitOrigin-RevId: 46cd1a75303b72ea64e9694617fb43f4d3da5982

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/i18nize/afterNestedConcatenation.java

@@ -0,0 +1,5 @@
+class a {
+  void foo(String s, int i, boolean b) {
+    String desc = i18nizedExpr;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/i18nize/beforeNestedConcatenation.java

@@ -0,0 +1,5 @@
+class a {
+  void foo(String s, int i, boolean b) {
+    String desc = "Our " + s + " has " + (b ? i + " doo<caret>rs" : "many windows");
+  }
+}