HPCC-10601 Regression Suite test cases tags handling should be case-insensitive

Ignore case in tag checking
Improve tag handling.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #5251 from AttilaVamos/HPCC-10601-fix

HPCC-10601 Regression Suite test cases tags handling should be case-insensitive

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>