Dont' show udp protocol for LB rules if the provider is Virtual Router

### problem

Dont' show udp protocol for LB rules if the provider is Virtual Router

### versions

ACS 4.22.1

### The steps to reproduce the bug

1. Create an isolated network with network offering where LB is set to Virtual Router

2. Navigate Network > public ip address > create a LB > Select UDP proctocol > ADD a instance

3. Currently UDP protocol is not supported by HA PROXY tool( version - 2.6.12) , whichis responsible for creating LB rules.

HA Proxy supports UDP only in the commercial verison https://www.haproxy.com/documentation/haproxy-enterprise/

```
root@r-61-VM:~# cat /etc/haproxy/haproxy.cfg
global
log 127.0.0.1:3914 local0 info
chroot /var/lib/haproxy
user haproxy
group haproxy
daemon

defaults
log global
mode tcp
option dontlognull
retries 3
option redispatch
option forwardfor
stats enable
stats uri /admin?stats
stats realm Haproxy\ Statistics
stats auth admin1:AdMiN123
option httpclose
timeout connect 5000
timeout client 50000
timeout server 50000

listen cloud-default
bind 0.0.0.0:35999
option transparent
root@r-61-VM:~# ps -ef |grep haproxy
root 2062 1 0 15:06 ? 00:00:00 /usr/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -S /run/haproxy-master.sock
haproxy 2092 2062 0 15:06 ? 00:00:00 /usr/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -S /run/haproxy-master.sock


```

### What to do about it?

Don't show udp protocol when creating LB rule in case of Virtual router

从 Network > public IP address > create a LB 开始，在选中 Virtual Router 的情况下复现 provider 特定的协议选项。确认 Virtual Router 不提供 UDP 选项，同时受支持的选项仍然可用，然后验证由此产生的负载均衡器创建流程仍然有效。

由索引模型根据 Issue 内容生成。