feat(cli):migrate cloud network private vrack to API v2

[duboolivier]

Description

Migrates the cloud network private vrack network and subnet commands from the
v1 region-based API to the Cloud API v2 (/v2/publicCloud/project/{id}/network...).

• network (vRack private): list, get, create, delete, edit (new, PUT)
• subnet: list, get, create, delete, edit (new, PUT); a subnet inherits
  the parent network's region when --region is omitted
• Adds --wait (async provisioning) via waitForCloudResourceReady
• cloud network public and cloud network gateway are left on v1 (no v2 equivalent yet)

Type of change

• New feature (non-breaking change which adds functionality)
• Improvement (improvement of existing commands)

Checklist:

• My code follows the style guidelines of this project
• I have commented my code
• I ran go mod tidy
• I have added tests that prove my fix is effective or that my feature works

Tests

End-to-end manual test against the real v2 API on a real project (IDs anonymized).
Full lifecycle validated, including the new edit commands.

Create private network (async, --wait)

$ ovhcloud cloud network private vrack create GRA11 --name test-vrack-v2 --vlan-id 3567 --wait
Still waiting for resource to be ready (status=CREATING)…
 Network <networkId> created successfully in region GRA11

List

$ ovhcloud cloud network private vrack list
┌─────────────┬───────────────┬────────┬────────┬────────────────┐
│ id          │ name          │ region │ vlanId │ resourceStatus │
├─────────────┼───────────────┼────────┼────────┼────────────────┤
│ <networkId> │ test-vrack-v2 │ GRA11  │ 3567   │ READY          │
│ …           │ (other existing networks omitted)                │
└─────────────┴───────────────┴────────┴────────┴────────────────┘

Get

$ ovhcloud cloud network private vrack get <networkId>
Private network <networkId> — test-vrack-v2
Status: READY
Name:    test-vrack-v2
Region:  GRA11
VLAN ID: 3567

Edit — rename (new command)

$ ovhcloud cloud network private vrack edit <networkId> --name test-vrack-v2-renamed
 Resource updated successfully

$ ovhcloud cloud network private vrack get <networkId>
Name:    test-vrack-v2-renamed
Region:  GRA11
VLAN ID: 3567

Subnet create (async)

$ ovhcloud cloud network private vrack subnet create <networkId> --name sub1 --cidr 192.168.42.0/24 --dhcp-enabled --wait
Subnet <subnetId> created successfully

Subnet list

$ ovhcloud cloud network private vrack subnet list <networkId>
┌────────────┬──────┬────────┬─────────────────┬───────────┬─────────────┬────────────────┐
│ id         │ name │ region │ cidr            │ gatewayIp │ dhcpEnabled │ resourceStatus │
├────────────┼──────┼────────┼─────────────────┼───────────┼─────────────┼────────────────┤
│ <subnetId> │ sub1 │ GRA11  │ 192.168.42.0/24 │           │ true        │ READY          │
└────────────┴──────┴────────┴─────────────────┴───────────┴─────────────┴────────────────┘

Subnet get → edit (new command) → get

$ ovhcloud cloud network private vrack subnet get <networkId> <subnetId>
 Subnet <subnetId> — sub1
CIDR: 192.168.42.0/24   DHCP Enabled: true
Allocation Pools: 192.168.42.1 → 192.168.42.254

$ ovhcloud cloud network private vrack subnet edit <networkId> <subnetId> --name sub1-renamed
 Resource updated successfully

$ ovhcloud cloud network private vrack subnet get <networkId> <subnetId>
 Subnet <subnetId> — sub1-renamed   (CIDR / DHCP unchanged)