endpoint: add endpoint get model function benchmarking test
endpoint: add endpoint get model function benchmarking test

* Add benchmarking tests for endpoint `GetModel` function to benchmark
various function which corresponds to getEndpoints* functions.

Signed-off-by: Deepesh Pathak <f919440c3f96a4d11125a0337b02a5a6cc587b4e@gmail.com>

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