Avoid any remote pruning in sylva-units delete hook

Francois Eleouetrequested to merge
fe/avoid-pruning-remmote-helmreleases into main

What does this MR do and why?

Avoid any remote pruning in sylva-units delete hook

  • Suspend helmreleases targeting remote cluster to prevent flux from attempting to uninstall them
  • Use app.kubernetes.io/instance as selector as it is set on all units
  • Introduce a namespaced "_kubectl" command to simplify script

CI script is also revisited (in a separate commit) to fail before deleting the workload cluster namespace if there are some remaining resources. This will ease the troubleshooting of pre-delete-hook errors.

Relates to: #1216 (closed) Closes: #1241 (closed)

Edited by Francois Eleouet

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