cronjob to delete left-over longhorn instance-managers

Francois Eleouetrequested to merge
longhorn-instance-managers-cleanup into main

What does this MR do and why?

Introduce a cronjob to cleanup longhorn instance-managers that are blocking node drain as they have ghost engines.

Related reference(s)

Relates-to: #1422 (closed)

Edited by Francois Eleouet

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