boost: apply enumcheck directives (vitessio#1314)

Signed-off-by: Matt Layher <mdlayher@planetscale.com>

Signed-off-by: Matt Layher <mdlayher@planetscale.com>

Author: mdlayher

go/boost/server/controller/boostplan/operators/errors.go

@@ -7,6 +7,7 @@ import (
 	"vitess.io/vitess/go/vt/sqlparser"
 )
 
+//enumcheck:exhaustive
 type UnsupportedType int
 
 const (

go/vt/proto/vtboost/vtboost.pb.go

@@ -44,6 +44,7 @@ message Materialization {
 };
 
 message GraphvizRequest {
+  //enumcheck:exhaustive
   enum Clustering {
     NONE = 0;
     DOMAIN = 1;
@@ -93,6 +94,7 @@ message DescribeRecipeResponse {
 };
 
 message ClusterState {
+  //enumcheck:exhaustive
   enum State {
     DISABLED = 0;
     PRIMARY = 1;
@@ -166,6 +168,7 @@ message ControllerState {
   int64 recipe_version = 3;
 
   message RecipeStatus {
+    //enumcheck:exhaustive
     enum Progress {
       UNKNOWN = 0;
       APPLYING = 1;