[WIP] UDN: L2: Add missing remote LRPs: One step closer towards making external->services work on L2!

[tssurya]

What this PR does and why is it needed

In the UDN enhancement https://github.com/openshift/enhancements/blob/master/enhancements/network/user-defined-network-segmentation.md#pod-egress we had discussed about adding remote ports on L2 switch for remote node's GR ports so that communication between GR's can work properly.

We somehow missed adding this with the L2 main topology

Which issue(s) this PR fixes

This fixes that since its required for external->services work on L2.

Special notes for reviewers

How to verify it

e2e tests are present in services section that supports this

Details to documentation updates

Description for the changelog

Adds remote LSP port for remote node's GR LRP on L2 UDPNs

Does this PR introduce a user-facing change?

NONE

[tssurya]

hmm locally it passes at v4 level and only fails v6, its weird this lane is failing at v4 itself!

[qinqon]

hmm locally it passes at v4 level and only fails v6, its weird this lane is failing at v4 itself!

Without he tunnel key collision fix, the L2 test can be failing.

[tssurya]

https://github.com/ovn-org/ovn-kubernetes/actions/runs/11340936533/job/31539400506?pr=4777
we have a race condition!!! yayy

[tssurya]

hmm locally it passes at v4 level and only fails v6, its weird this lane is failing at v4 itself!

Without he tunnel key collision fix, the L2 test can be failing.

but I use keys from backside hehe while pods use it from front side, so idallocator doesn't give out 30657 or whatever is the highest id to the pod but but

its a race!! :) I don't see this happening always sooo maybe you are right here :) I will go with fixing this properly as discussed first and see