fix(insights): strip sql comments without trailing newline

[mjq]

Found this case when investigating projects emitting high cardinality metrics. SQL comments that did not end in a newline aren't being stripped correctly. Updated the comment-matching regex to additionally match comments up to the end of the haystack.

Note that there's an interesting interaction with the regexes that meant that the test

    scrub_sql_test!(
        comment_without_ending_line_break,
        "SELECT * FROM comments LIMIT 1 -- comment", // note the explicit limit
        "SELECT * FROM comments LIMIT %s"
    );

already passed without these changes, while the version with the named limit param (LIMIT %(param_1)s) did not.