The previous 5-min timeout on `until kubectl get deploy/linstor-controller`
fired during cold-install runs where the LINSTOR HR's dependency chain
(cert-manager → piraeus-operator-crds → piraeus-operator → linstor)
takes longer than 5 min to resolve, killing the whole post-install-prep
script via `set -eu`. With CI's 3x retry the failure was hidden; with the
retry removed it would surface every cold install.
Wait on the LINSTOR HR being Ready first (the actual prerequisite),
then keep the existence-poll as a near-instant backstop, then wait
for Available. Same final semantics, no fragile fixed-window timeout.
Surfaced by PR #2500 cozyreport diagnostics (post-install-prep.log).
Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>
eb87413556