using GO generics

[shireenf-ibm]

why could not success yet with using generics to avoid duplicates in eval/k8s/adminnetpol.go?

according to https://tip.golang.org/doc/go1.18#generics :

The Go compiler does not support accessing a struct field x.f where x is of type parameter type even if all types in the type parameter’s type set have a field f. We may remove this restriction in a future release.

till GO 1.23 this restriction is not removed yet.
for example:
replacing func egressRuleSelectsPeer(rulePeers []apisv1a.AdminNetworkPolicyEgressPeer, dst Peer) (bool, error) and
func ingressRuleSelectsPeer(rulePeers []apisv1a.AdminNetworkPolicyIngressPeer, src Peer) (bool, error)

with a func using generics like this :
func xgressRuleSelectsPeer[T apisv1a.AdminNetworkPolicyEgressPeer | apisv1a.AdminNetworkPolicyIngressPeer](rulePeers []T, dst Peer) (bool, error)

will fail with errors such as :
rulePeers[i].Namespaces undefined (type T has no field or method Namespaces)
a useful way to skip the errors is to define an interface with some Getter funcs to be implemented on the "inheriting types"
of the parameters.
but in this case : since our parameters are not of local types, we can not define new methods (like getters) on them;
not even with using aliases since then we'll need to copy values in calling funcs into the aliases and
this is not more efficient than current solutions.

@todo: if GO is upgraded to a release that does not has this restriction on types with same fields, replace following two "duplicated" funcs with one func that uses generics type
following two funcs egressRuleSelectsPeer and ingressRuleSelectsPeer:
(same for updateConnsIfEgressRuleSelectsPeer and updateConnsIfIngressRuleSelectsPeer and maybe other funcs)