Similar to T367731

Now that IPIP has been rolled out to all the POPs we should be able to simplify the POPs network topology by removing now unnecessary configuration/links.

Slight drawback here is that in ulsfo/eqsin LVS traffic towards public hosts (if any) will hair-pin through the routers and back to the switches.
As a reminder, the CP servers are on the private vlan, so they won't be impacted. This also doesn't happen in drmrs/esams/magru as routing between vlans happens on the switches.

As no physical changes need to be done, it can be rolled back easily if any issues.
Steps along the lines of:

1. Depool the site
2. Remove the vlan and and IP config on the LVS
3. Remove the vlan trunking on the switch
4. Check monitoring (make sure health checks are still working)
5. Repool the site