test: Wait for IPCache entries in testSessionAffinity
test: Wait for IPCache entries in testSessionAffinity

We need to wait for an IPCache entry of the restarted pod. Otherwise, a
next testSessionAffinity test (with fromOutside = true) might fail, as
it could take up to 10s for the entry to appear. See [1] for more
details.

This is a temporary fix to get rid of the session affinity flakes.

[1]: https://github.com/cilium/cilium/issues/11751

Signed-off-by: Martynas Pumputis <6b0d31c0d563223024da45691584643ac78c96e8@lambda.lt>

michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,cilium-team/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium-team/cilium,tklauser/cilium