azure: Setting experimental MachinePool featuregate to false

This feature gate was set to a default of true upstream.
Setting it to false locally.

Author: sadasu

pkg/clusterapi/system.go

@@ -182,6 +182,7 @@ func (c *system) Run(ctx context.Context) error {
 					"--health-addr={{suggestHealthHostPort}}",
 					"--webhook-port={{.WebhookPort}}",
 					"--webhook-cert-dir={{.WebhookCertDir}}",
+					"--feature-gates=MachinePool=false",
 				},
 				map[string]string{},
 			),