Add multi-prefix comment support for SQL scripts

Update `ResourceDatabasePopulator` and `ScriptUtils` so that more than
one comment prefix can be used when processing SQL scripts. This
feature is particularly useful when dealing with scripts provided by
Quartz since they often use a mix `--` and `#`.

Closes gh-23289

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

@@ -0,0 +1,18 @@
+-- The next comment line has no text after the '--' prefix.
+--
+-- The next comment line starts with a space.
+ -- x, y, z...
+
+insert into customer (id, name)
+values	(1, 'Rod; Johnson'), (2, 'Adrian Collier');
+-- This is also a comment.
+insert into orders(id, order_date, customer_id)
+values (1, '2008-01-02', 2);
+# A comment with a different prefix
+insert into orders(id, order_date, customer_id) values (1, '2008-01-02', 2);
+INSERT INTO persons( person_id--
+                   , name)
+^ A comment with yet another different prefix
+VALUES( 1      -- person_id
+      , 'Name' --name
+);--