gpstate behave test failure fix

[piyushc01]

With latest commit #8e99ec3 it takes little longer to update sync status even when bytes to replicate are zero and leading to gpstate test failure. Current changes add To wait till segment replication status is in sync before calling gpstate.

issue was seen after this changes: https://github.com/greenplum-db/gpdb/pull/13891

Testing: Ran the test localy and also created concourse pipeline.

Here are some reminders before you submit the pull request

• [ ] Add tests for the change
• [ ] Document changes
• [ ] Communicate in the mailing list if needed
• [ ] Pass make installcheck
• [ ] Review a PR in return to support the community