HPCC-11494 Roxie dali notification issues

Move the subscription for the PackageSets section out to the Global manager,
so not recreated every reload.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #5924 from richardkchapman/roxie-subscriptions

HPCC-11494 Roxie dali notification issues

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>