[Go] Use protojson instead. (#33718)

Co-authored-by: lostluck <[email protected]>

sdks/go/pkg/beam/core/runtime/graphx/translate.go

@@ -17,7 +17,6 @@ package graphx
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"sort"
 	"strings"
@@ -35,6 +34,7 @@ import (
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/internal/errors"
 	pipepb "github.com/apache/beam/sdks/v2/go/pkg/beam/model/pipeline_v1"
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/options/resource"
+	"google.golang.org/protobuf/encoding/protojson"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/durationpb"
 )
@@ -125,7 +125,7 @@ func CreateEnvironment(ctx context.Context, urn string, extractEnvironmentConfig
 	case URNEnvProcess:
 		config := extractEnvironmentConfig(ctx)
 		payload := &pipepb.ProcessPayload{}
-		if err := json.Unmarshal([]byte(config), payload); err != nil {
+		if err := protojson.Unmarshal([]byte(config), payload); err != nil {
 			return nil, fmt.Errorf("unable to json unmarshal --environment_config: %w", err)
 		}
 		serializedPayload = protox.MustEncode(payload)