Fix REPACK decoding worker not cleaned up on FATAL exit

When the launching backend of REPACK (CONCURRENTLY) is terminated via
pg_terminate_backend(), ProcDiePending causes ereport(FATAL) which
bypasses PG_FINALLY blocks.  As a result, stop_repack_decoding_worker()
is never called, leaving the decoding worker running indefinitely and
holding its temporary replication slot.

Fix by using PG_ENSURE_ERROR_CLEANUP, which handles both ERROR and
FATAL exits.

Author: Baji Shaik <[email protected]>
Reviewed-by: Sami Imseih <[email protected]>
Reviewed-by: Álvaro Herrera <[email protected]>
Discussion: 
https://postgr.es/m/ca+fm-rnopxl2n7db_a0anmxv_adu6jwj4pnoptmtbuapdpv...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0160143ad9a686a7e705348da1f90e63a2a31536

Modified Files
--------------
src/backend/commands/repack.c | 42 +++++++++++++++++++++++++-----------------
1 file changed, 25 insertions(+), 17 deletions(-)

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