Fix Nova issue on grenade SLURP jobs

So far we were getting a nova.exception.TooOldComputeService
on .1 cycles, on the optional SLURP jobs (optional on .1 cycles).

This patch adds the Nova workaround other OSP components use.

Change-Id: I646d45b179a7beda228d46cde8c30aad1fb5d449
Signed-off-by: Omer <oschwart@redhat.com>

.zuul.yaml

@@ -184,6 +184,8 @@
         # When master is G (2026.1), this should become Epoxy (2025.1),
         # and so forth.
         grenade_from_branch: stable/2024.2
+        grenade_localrc:
+          NOVA_ENABLE_UPGRADE_WORKAROUND: True
 
 - job:
     name: designate-grenade-pdns4-skip-level