Add protobufs for Workload Identity Revocation (#51996) (#52032)

* Add protos for workload identity revocations

* Add event marshal/unmarshaling

* Restore lexical order

* Add more detailed comments to messages

api/client/events.go

@@ -140,6 +140,10 @@ func EventToGRPC(in types.Event) (*proto.Event, error) {
 			out.Resource = &proto.Event_WorkloadIdentity{
 				WorkloadIdentity: r,
 			}
+		case *workloadidentityv1pb.WorkloadIdentityX509Revocation:
+			out.Resource = &proto.Event_WorkloadIdentityX509Revocation{
+				WorkloadIdentityX509Revocation: r,
+			}
 		default:
 			return nil, trace.BadParameter("resource type %T is not supported", r)
 		}
@@ -624,6 +628,9 @@ func EventFromGRPC(in *proto.Event) (*types.Event, error) {
 	} else if r := in.GetPluginStaticCredentials(); r != nil {
 		out.Resource = r
 		return &out, nil
+	} else if r := in.GetWorkloadIdentityX509Revocation(); r != nil {
+		out.Resource = types.Resource153ToLegacy(r)
+		return &out, nil
 	} else {
 		return nil, trace.BadParameter("received unsupported resource %T", in.Resource)
 	}