…mental open (#63209)

### What problem does this PR solve?

Problem Summary:

In auto-detect insert overwrite, BE sender could publish newly replaced
temporary partitions to local row routing before incremental open
finished on target BEs.

The race was:

1. One sender calls FE `replacePartition` and receives new temporary
partition/tablet metadata.
2. The sender records the new partition id and replaces local
`_vpartition` routing first.
3. Another concurrent batch can then route rows to the new tablet.
4. The first sender has not finished incremental open yet, so the target
BE may not have created the delta writer for that tablet.
5. The target BE returns `unknown tablet to append data`.

This PR makes the sender finish `_create_partition_callback`, including
incremental open/open_wait, before publishing the new partition/tablet
to local routing and marking the new partition as handled.