wdclient: count an elapsed caller deadline as caller-gave-up in LookupVolumeIds (#12151)

* wdclient: treat an elapsed caller deadline as caller-gave-up on lookup errors

gRPC can surface its own DeadlineExceeded a tick before ctx.Err() becomes
visible, so a lookup that died on the caller's deadline was sporadically
recorded as a filer failure (seen in the linux/386 job).

* wdclient: reinterpret only deadline errors against an elapsed caller deadline

weed/wdclient/filer_client.go

@@ -788,8 +788,16 @@ func (p *filerVolumeProvider) LookupVolumeIds(ctx context.Context, volumeIds []s
 			}()
 
 			if err != nil {
-				// a caller that gave up says nothing about this filer
-				if ctxErr := ctx.Err(); ctxErr != nil {
+				// a caller that gave up says nothing about this filer; gRPC can
+				// surface its own DeadlineExceeded a tick before ctx.Err()
+				// becomes visible, so reinterpret only deadline errors this way
+				ctxErr := ctx.Err()
+				if ctxErr == nil && status.Code(err) == codes.DeadlineExceeded {
+					if dl, ok := ctx.Deadline(); ok && !dl.After(time.Now()) {
+						ctxErr = context.DeadlineExceeded
+					}
+				}
+				if ctxErr != nil {
 					if lastErr != nil {
 						return nil, fmt.Errorf("%w (earlier filer error: %v)", ctxErr, lastErr)
 					}