Bug 30943: Simplify background jobs code using helpers

Bug 30943: Simplify background jobs code using helpers

This patch makes the current background jobs classes use the added
helpers in order to simplify them.

No behavior change is expected.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Rebased-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>