pgsql: Fix the missing table sync due to improper invalidation handling

Fix the missing table sync due to improper invalidation handling.

We missed performing table sync if the invalidation happened while the
non-ready tables list was being prepared. This occurs because the sync
state was set to valid at the end of non-ready table list preparation
irrespective of the invalidations processed while the list is being
prepared.

Fix it by changing the boolean variable to a tri-state enum and by setting
table state to valid only if no invalidations have occurred while the list
is being prepared.

Reprted-by: Alexander Lakhin
Diagnosed-by: Alexander Lakhin
Author: Vignesh C
Reviewed-by: Hou Zhijie, Alexander Lakhin, Ajin Cherian, Amit Kapila
Backpatch-through: 15
Discussion: https://postgr.es/m/711a6afe-edb7-1211-cc27-1bef8239eec7@gmail.com

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a9155efc7004a49b387f061dd90cb0b59a6d146f

Modified Files
--------------
src/backend/replication/logical/tablesync.c | 25 +++++++++++++++++++++----
src/tools/pgindent/typedefs.list | 1 +
2 files changed, 22 insertions(+), 4 deletions(-)