pgsql: Remove Subscription conninfo field; generate in caller.

Remove Subscription conninfo field; generate in caller.

After server-based subscriptions, conninfo became more than just a
catalog field. It has its own error paths, and it's important that
callers that don't need conninfo don't encounter errors related to it.

Reviewed-by: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Reviewed-by: Hayato Kuroda (Fujitsu) <kuroda(dot)hayato(at)fujitsu(dot)com>
Discussion: https://postgr.es/m/20260710195902.4f.noahmisch%40microsoft.com
Backpatch-through: 19

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/6d04cd2b84496d727344be1acb6287452982c9bd

Modified Files
--------------
src/backend/catalog/pg_subscription.c | 105 ++++++++++++++-----------
src/backend/commands/subscriptioncmds.c | 43 +++++++---
src/backend/replication/logical/sequencesync.c | 2 +-
src/backend/replication/logical/tablesync.c | 2 +-
src/backend/replication/logical/worker.c | 24 +++++-
src/include/catalog/pg_subscription.h | 6 +-
src/include/replication/worker_internal.h | 1 +
7 files changed, 118 insertions(+), 65 deletions(-)