Drop celery dependencies

Cleber Rosarequested to merge
cleber.gnu/insights4ci-api-server:remove_unused_celery into main

In order to ease development, let's remove the dependencies and code that is not serving a purpose at this time. The previous effort is always in VC, so we can restore it if needed.

Signed-off-by: Cleber Rosa crosa@redhat.com

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