Add client tests for psycopg2 python client

[fulghum]

Adds regression tests using psycopg2 for fix from #2216

[github-actions]

	Main	PR
covering_index_scan_postgres	558.32/s	565.52/s	+1.2%
index_join_postgres	120.59/s	119.98/s	-0.6%
index_join_scan_postgres	181.78/s	181.05/s	-0.5%
index_scan_postgres	11.39/s	11.08/s	-2.8%
oltp_point_select	2347.93/s	2323.55/s	-1.1%
oltp_read_only	1698.22/s	1696.77/s	-0.1%
select_random_points	108.13/s	106.31/s	-1.7%
select_random_ranges	434.65/s	430.20/s	-1.1%
table_scan_postgres	10.99/s	11.00/s	0.0%
types_table_scan_postgres	5.11/s	4.99/s	-2.4%

[github-actions]

	Main	PR
Total	42090	42090
Successful	17565	17565
Failures	24525	24525
Partial Successes1	5583	5583

	Main	PR
Successful	41.7320%	41.7320%
Failures	58.2680%	58.2680%

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. ↩

[Hydrocharged]

LGTM!