refactor: move manager clone into start_maintenance_loop task

[xdustinface]

We already clone self two times to make the connect_fn happen. So this PR just clones self and moves it into the task, getting rid of all extra variables and connect_fn. Just to simplify it.

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[github-actions]

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.