cilium-cli: disable host-firewall-egress-to-fqnds test on RHEL

host-firewall-egress-to-fqdns consistently fails in the kube-proxy-1
configuration (using rhel8.10 kernel) although it appears to succeed
in all other cases it runs in. It is unclear why this happens. Note that
other L7 tests (to-fqdns, client-egress-l7, client-egress-l7-named-port,
client-egress-tls-cni) using pod-to-world scenarios are disabled on RHEL
kernels, see commit message in b1d70aa. Possibly the reason this test
fails on RHEL is related to that. However that may be, this commit
disables the test on RHEL to make scheduled CI runs usable.

Signed-off-by: Anton Tykhyy <atykhyy@gmail.com>

Author: atykhyy

cilium-cli/connectivity/builder/host_firewall_egress_to_fqdns.go

@@ -23,6 +23,7 @@ func (t hostFirewallEgressToFqdns) build(ct *check.ConnectivityTest, templates m
 		WithCondition(differentExternalTargets).
 		WithFeatureRequirements(
 			features.RequireDisabled(features.EndpointRoutes), // currently broken when proxying to in-cluster endpoints, see #45957
+			features.RequireDisabled(features.RHEL),           // currently broken, see #47921
 			features.RequireEnabled(features.L7Proxy),
 			features.RequireEnabled(features.HostFirewall)).
 		WithCiliumClusterwidePolicy(templates["hostFirewallEgressToFQDNsPolicyYAML"]).