HPCC-11584 Add tooltip to disabled Download button on Error/Warning Page

Fixes HPCC-11584

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5994 from GordonSmith/HPCC-11584

HPCC-11584 Add tooltip to disabled Download button on Error/Warning Page

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>