preserve text blocks when converting to (message)format string (IDEA-217253, IDEA-218831)

and use new text block escaping

GitOrigin-RevId: cc8eea8aa0c638b967e40b6a6b4b9dea1cfed61d

java/java-tests/testData/codeInsight/concatenationToMessageFormat/textblock.java

@@ -0,0 +1,11 @@
+class C {
+
+  void x(int a, int b) {
+    String s = """
+      the text\n block
+      line2
+      """ +
+               a + b + <caret>//keep me
+               " \"to\" be";
+  }
+}