pgsql: SQL/JSON: Respect OMIT QUOTES when RETURNING domains over jsonb

SQL/JSON: Respect OMIT QUOTES when RETURNING domains over jsonb

populate_domain() didn't take into account the omit_quotes flag passed
down to json_populate_type() by ExecEvalJsonCoercion() and that led
to incorrect behavior when the RETURNING type is a domain over
jsonb. Fix that by passing the flag by adding a new function
parameter to populate_domain().

Reported-by: Jian He <jian(dot)universality(at)gmail(dot)com>
Discussion: https://postgr.es/m/CACJufxEo4sUjKCYtda0_qt9tazqqKPmF1cqhW9KBOUeJFqQd2g@mail.gmail.com
Backpatch-through: 17

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/4fc6a555606de003690d46e900339e78214ee363

Modified Files
--------------
src/backend/utils/adt/jsonfuncs.c | 11 ++++++-----
src/test/regress/expected/sqljson_queryfuncs.out | 15 +++++++++++++++
src/test/regress/sql/sqljson_queryfuncs.sql | 5 +++++
3 files changed, 26 insertions(+), 5 deletions(-)