Remove duplicates during gitlab import [v2]

Jan Richterrequested to merge
jarichte/insights4ci:gitlab_import_improve_v2 into main

This change will check if the pipelines already exists in insights4ci database during the gitlab import. Because of this, the import will add only new pipelines which haven't been in database yet. This will avoid duplicates, which were made by multiple imports from the same repository.

Reference: #13

Signed-off-by: Jan Richter jarichte@redhat.com

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