issue: #33550
cause wrong impl of UpdateCollectionNextTarget, if ReleaseCollection and
UpdateCollectionNextTarget happens at same time, the the released
partition's segment list may be add to target again, and delegator will
be marked as unserviceable due to lack of segment.
This PR fix the impl of UpdateCollectionNextTarget
Signed-off-by: Wei Liu <wei.liu@zilliz.com>