Add TAP test for GUC settings passed via CONNECTION in logical replication.

Commit d926462d819 restored the behavior of passing GUC settings from
the CONNECTION string to the publisher's walsender, allowing per-connection
configuration.

This commit adds a TAP test to verify that behavior works correctly.

Since commit d926462d819 was recently applied and backpatched to v15,
this follow-up commit is also backpatched accordingly.

Author: Fujii Masao <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Reviewed-by: Kirill Reshke <[email protected]>
Reviewed-by: Amit Kapila <[email protected]>
Reviewed-by: Japin Li <[email protected]>
Discussion: 
https://postgr.es/m/CAHGQGwGYV+-abbKwdrM2UHUe-JYOFWmsrs6=qicyjo-j+-w...@mail.gmail.com
Backpatch-through: 15

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/67edd54f0639d8e194c6f0379b9fed6220f2f36b

Modified Files
--------------
src/test/subscription/t/001_rep_changes.pl | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)

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