pgsql: Introduce PG_TEST_TIMEOUT_DEFAULT for TAP suite non-elapsing tim

Introduce PG_TEST_TIMEOUT_DEFAULT for TAP suite non-elapsing timeouts.

Slow hosts may avoid load-induced, spurious failures by setting
environment variable PG_TEST_TIMEOUT_DEFAULT to some number of seconds
greater than 180. Developers may see faster failures by setting that
environment variable to some lesser number of seconds. In tests, write
$PostgreSQL::Test::Utils::timeout_default wherever the convention has
been to write 180. This change raises the default for some briefer
timeouts. Back-patch to v10 (all supported versions).

Discussion: https://postgr.es/m/20220218052842.GA3627003@rfd.leadboat.com

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/f60bb3e0a9044058a3df1d75bb900e77e51ad4ed

Modified Files
--------------
contrib/amcheck/t/002_cic.pl | 3 ++-
contrib/amcheck/t/003_cic_2pc.pl | 14 +++++++------
src/bin/pg_ctl/t/004_logrotate.pl | 2 +-
src/bin/pg_dump/t/002_pg_dump.pl | 3 ++-
src/bin/psql/t/010_tab_completion.pl | 6 +++---
src/bin/scripts/t/080_pg_isready.pl | 4 ++--
src/test/perl/PostgresNode.pm | 24 +++++++++++++---------
src/test/perl/TestLib.pm | 8 ++++++--
src/test/recovery/t/003_recovery_targets.pl | 4 ++--
src/test/recovery/t/006_logical_decoding.pl | 6 ++++--
.../recovery/t/010_logical_decoding_timelines.pl | 4 ++--
src/test/recovery/t/013_crash_restart.pl | 2 +-
src/test/recovery/t/017_shm.pl | 13 ++++++------
src/test/recovery/t/019_replslot_limit.pl | 6 +++---
src/test/recovery/t/021_row_visibility.pl | 7 ++-----
src/test/recovery/t/022_crash_temp_files.pl | 6 +-----
src/test/recovery/t/024_archive_recovery.pl | 4 ++--
src/test/subscription/t/015_stream.pl | 2 +-
18 files changed, 63 insertions(+), 55 deletions(-)