Summary:
Original commit: caf96a7694f709f6404703a6552301763dc438a0 / D42096
Clean cherry pick, no conflicts.

Due to a bug with the CreateTable code, it is possible for GetTableInfo to return for a table being created a TableInfo in state UNKNOWN.  Fixing that bug looks difficult and risky so for now we are just going to tolerate the bug.

In particular, when we look up the sequences_data table, we are going to ignore it if we see state UNKNOWN instead of the current DFATAL.
Jira: DB-15349

Test Plan:
```
ybd --cxx-test xcluster_outbound_replication_group-itest -n 200  --gtest_filter '*.AddDeleteNamespaces/0'
```

Reviewers: zdrudi, xCluster

Reviewed By: zdrudi

Subscribers: ybase

Differential Revision: https://phorge.dev.yugabyte.com/D42116