feat: drop the get_device_warnings override; the pending updates are the fact (0.2.0)

The override counted "N upgraded" in an apt simulation run without a
fixed locale -- nothing matched on a German host -- and hid held-back
packages, which FULL_UPGRADE installs. netOrk names updates_available
from get_available_updates (netOrk #1111).

napalm_openmediavault/openmediavault.py

@@ -85,44 +85,6 @@ class OpenMediaVaultDriver(StorageDriver, LinuxDriver):
             pass
         return facts
 
-    # ── Warnings ──────────────────────────────────────────────────────────────
-
-    def get_device_warnings(self) -> list[dict[str, Any]]:
-        """Return warnings, ignoring packages held back by apt-get upgrade.
-
-        On OMV, kernel and OMV-specific packages are routinely held back
-        (they require dist-upgrade or omv-upgrade).  Reporting them as
-        "updates available" after a successful apt-get upgrade is misleading.
-        We simulate the upgrade first and only warn if there are packages
-        that a standard apt-get upgrade would actually install.
-        """
-        warnings: list[dict[str, Any]] = []
-        try:
-            sim = self._sudo(
-                "DEBIAN_FRONTEND=noninteractive apt-get upgrade --simulate 2>&1",
-                read_timeout=60,
-            )
-            m = re.search(r'(\d+) upgraded', sim)
-            upgradable_count = int(m.group(1)) if m else 0
-        except Exception:
-            upgradable_count = -1  # unknown — fall back to parent behaviour
-
-        if upgradable_count == 0:
-            return []  # nothing to do with apt-get upgrade; held-back only
-        if upgradable_count < 0:
-            return super().get_device_warnings()
-
-        updates = self.get_available_updates()
-        if updates:
-            warnings.append({
-                "code": "updates_available",
-                "meta": {
-                    "count": upgradable_count,
-                    "packages": [u.get("name", "") for u in updates[:10]],
-                },
-            })
-        return warnings
-
     # ── Physical disks ─────────────────────────────────────────────────────────
 
     def get_disks(self) -> list[PhysicalDiskDict]: