Fix for ScriptUtils failure when '--' occurs inside a multi-line comment on the same line as '*/' (#22392)

* Test for multi-line comment block where the comment end delimiter occurs on a line starting with the single-line comment prefix
* ScriptUtils successfully parses a SQL script containing a multi-line comment block where the comment-end delimiter occurs on a line starting with the single-line comment prefix.

spring-jdbc/src/test/resources/org/springframework/jdbc/datasource/init/test-data-with-multi-line-nested-comments.sql

@@ -0,0 +1,23 @@
+/* This is a multi line comment
+ * The next comment line has no text
+
+ * The next comment line starts with a space.
+ *  x, y, z...
+ */
+
+INSERT INTO users(first_name, last_name) VALUES('Juergen', 'Hoeller');
+-- This is also a comment.
+/*-------------------------------------------
+-- A fancy multi-line comments that puts
+-- single line comments inside of a multi-line
+-- comment block.
+Moreover, the block commend end delimiter
+appears on a line that can potentially also
+be a single-line comment if we weren't
+already inside a multi-line comment run.
+-------------------------------------------*/
+ INSERT INTO
+users(first_name, last_name)    -- This is a single line comment containing the block-end-comment sequence here */ but it's still a single-line comment
+VALUES( 'Sam'     -- first_name
+      , 'Brannen' -- last_name
+);--