[java-inspections] ConstantExpressionInspection: minor fixes

1. Disable for literals
2. Checkbox description moved to the form

GitOrigin-RevId: 48303e0c704ef9db5e09f64f34d3ee32d2743194

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantExpression/beforeLiteral.java

@@ -0,0 +1,7 @@
+// "Compute constant value of '""" ...'" "false"
+class Literal {
+  void test() {
+    System.out.println("""
+        <caret>Hello""");
+  }
+}