Remove daily execution of old Pulpcore releases

Don’t know if this is the right tag.

Right now we run daily pipelines for Pulpcore 3.7/3.11/3.14/3.15, these versions are not used by supported Katello releases anymore, I know that other projects like galaxy-ng[1] still consume and requests some updates for older version specially for CVEs, with this I think we should just remove the daily execution, and execute the pipeline if it’s necessary to test one new package.

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Got this PR created to remove the older versions