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launchpad: Reimplement lister using new Lister API

Description

launchpad: Reimplement lister using new Lister API

Port launchpad lister to the swh.lister.pattern.Lister API.

Last update date of each listed git repositories is now sent to the scheduler.

The lister can work in incremental mode, only modified repositories since
the last listing operation will be returned in that case.

Closes T2992