fix(fw): start: remove ipset probe

This probe is causing kernel modules to be loaded even if the ipset
backend will not be used due to "omit native ipsets". Since the backend
and iptables are deprecated lets just remove the probe and let it fail
at runtime.

Fixes: RHEL-36234

Author: erig0

src/firewall/core/fw.py

@@ -272,19 +272,6 @@ def _start_check_tables(self):
             raise FirewallError(errors.UNKNOWN_ERROR, "No IPv4 and IPv6 firewall.")
 
     def _start_probe_backends(self):
-        try:
-            self.ipset_backend.set_list()
-        except ValueError:
-            if self.nftables_enabled:
-                log.info1(
-                    "ipset not usable, disabling ipset usage in firewall. Other set backends (nftables) remain usable."
-                )
-            else:
-                log.warning("ipset not usable, disabling ipset usage in firewall.")
-                self.ipset_supported_types = []
-            # ipset is not usable
-            self.ipset_enabled = False
-
         self.ip4tables_backend.fill_exists()
         if not self.ip4tables_backend.restore_command_exists:
             if self.ip4tables_backend.command_exists: