fix(block): ignore inaccessible legacy snapshot in diff (#3258)

* fix(block): ignore inaccessible legacy snapshot in diff

* fix(block): remove forceNew to add customdiff

* set snapshot_id to null if legagcy one

* remove dev.tfrc

* update cassettes export-to-s3

* update cassettes

* fix forceNew add Locality to customDiff

* fix forceNew add Locality to customDiff

* Delete tests/dev.tfrc

Author: Laure-di

internal/services/block/helpers_block.go

@@ -9,7 +9,9 @@ import (
 	block "github.com/scaleway/scaleway-sdk-go/api/block/v1alpha1"
 	"github.com/scaleway/scaleway-sdk-go/api/instance/v1"
 	"github.com/scaleway/scaleway-sdk-go/scw"
+	"github.com/scaleway/terraform-provider-scaleway/v2/internal/dsf"
 	"github.com/scaleway/terraform-provider-scaleway/v2/internal/httperrors"
+	"github.com/scaleway/terraform-provider-scaleway/v2/internal/locality"
 	"github.com/scaleway/terraform-provider-scaleway/v2/internal/locality/zonal"
 	"github.com/scaleway/terraform-provider-scaleway/v2/internal/meta"
 	"github.com/scaleway/terraform-provider-scaleway/v2/internal/services/instance/instancehelpers"
@@ -56,6 +58,32 @@ func customDiffCannotShrink(key string) schema.CustomizeDiffFunc {
 	})
 }
 
+func customDiffSnapshot(key string) schema.CustomizeDiffFunc {
+	return func(ctx context.Context, diff *schema.ResourceDiff, i any) error {
+		if !diff.HasChange(key) {
+			return nil
+		}
+
+		oldValue, newValue := diff.GetChange(key)
+		if dsf.Locality(key, oldValue.(string), newValue.(string), nil) {
+			return nil
+		}
+
+		blockAPI := block.NewAPI(meta.ExtractScwClient(i))
+		zone, id, _ := locality.ParseLocalizedID(oldValue.(string))
+
+		_, err := blockAPI.GetSnapshot(&block.GetSnapshotRequest{
+			SnapshotID: id,
+			Zone:       scw.Zone(zone),
+		})
+		if (httperrors.Is403(err) || httperrors.Is404(err)) && newValue == "" {
+			return nil
+		}
+
+		return diff.ForceNew(key)
+	}
+}
+
 func migrateInstanceToBlockVolume(ctx context.Context, api *instancehelpers.BlockAndInstanceAPI, zone scw.Zone, volumeID string, timeout time.Duration) (*block.Volume, error) {
 	instanceVolumeResp, err := api.GetVolume(&instance.GetVolumeRequest{
 		Zone:     zone,