Added additional testing for TIMESTAMP

[Hydrocharged]

This adds testing for TIMESTAMP and TIMESTAMPTZ, which were missing. This also adds a step in CI that changes the locale to the west coast since we already had such assumptions in other tests (that were eventually changed), and there's no other way to test timezones otherwise.

[github-actions]

	Main	PR
covering_index_scan_postgres	589.63/s	587.79/s	-0.4%
index_join_postgres	124.34/s	124.36/s	0.0%
index_join_scan_postgres	182.98/s	181.34/s	-0.9%
index_scan_postgres	11.15/s	11.16/s	0.0%
oltp_point_select	2401.18/s	2392.94/s	-0.4%
oltp_read_only	1713.05/s	1716.75/s	+0.2%
select_random_points	111.36/s	111.96/s	+0.5%
select_random_ranges	447.10/s	448.94/s	+0.4%
table_scan_postgres	10.83/s	10.88/s	+0.4%
types_table_scan_postgres	4.99/s	5.05/s	+1.2%

[github-actions]

	Main	PR
Total	42090	42090
Successful	17651	17651
Failures	24439	24439
Partial Successes1	5575	5575

	Main	PR
Successful	41.9363%	41.9363%
Failures	58.0637%	58.0637%

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩

[fulghum]

LGTM!