Externalize VIndexes properly when not stopping after copy
Externalize VIndexes properly when not stopping after copy

We did not check for this config state at externalize.
When -stop_after_copy=false was used for the lookup vindex
materialization the workflow state will be Running when
it's healthy.

Signed-off-by: Matt Lord <5c2d6cb5cc654501c0d86e59cab3211bbda644af@gmail.com>

mahak/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,mahak/vitess