pgsql: Remove vacuum_defer_cleanup_age

Remove vacuum_defer_cleanup_age

vacuum_defer_cleanup_age was introduced before hot_standby_feedback and
replication slots existed. It is hard to use reasonably - commonly it will
either be set too low (not preventing recovery conflicts, while still causing
some bloat), or too high (causing a lot of bloat). The alternatives do not
have that issue.

That on its own might not be sufficient reason to remove
vacuum_defer_cleanup_age, but it also complicates computation of xid
horizons. See e.g. the bug fixed in be504a3e974. It also is untested.

This commit removes TransactionIdRetreatSafely(), as there are no users
anymore. There might be potential future users, hence noting that here.

Reviewed-by: Daniel Gustafsson <daniel(at)yesql(dot)se>
Reviewed-by: Justin Pryzby <pryzby(at)telsasoft(dot)com>
Reviewed-by: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
Discussion: https://postgr.es/m/20230317230930.nhsgk3qfk7f4axls@awork3.anarazel.de

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/1118cd37eb61e6a2428f457a8b2026a7bb3f801a

Modified Files
--------------
doc/src/sgml/config.sgml | 35 ---------
doc/src/sgml/high-availability.sgml | 28 ++-----
src/backend/storage/ipc/procarray.c | 105 ++------------------------
src/backend/storage/ipc/standby.c | 1 -
src/backend/utils/misc/guc_tables.c | 9 ---
src/backend/utils/misc/postgresql.conf.sample | 1 -
src/bin/pg_upgrade/server.c | 5 +-
src/include/storage/standby.h | 1 -
8 files changed, 15 insertions(+), 170 deletions(-)