use cockroach errors.Errorf for one-off errors

[zachmu]

This PR changes all uses of fmt.Errorf() to use the equivalent cockroach library instead. This gives us stack traces for all errors constructed this way during testing and debugging.

[github-actions]

	Main	PR
covering_index_scan_postgres	373.01/s	360.50/s	-3.4%
index_join_postgres	153.03/s	151.79/s	-0.9%
index_join_scan_postgres	184.28/s	182.12/s	-1.2%
index_scan_postgres	12.49/s	12.45/s	-0.4%
oltp_point_select	2874.39/s	2785.18/s	-3.2%
oltp_read_only	1909.58/s	1859.68/s	-2.7%
select_random_points	112.61/s	111.24/s	-1.3%
select_random_ranges	129.65/s	127.88/s	-1.4%
table_scan_postgres	11.87/s	11.83/s	-0.4%
types_table_scan_postgres	5.66/s	5.61/s	-0.9%

[github-actions]

	Main	PR
Total	42090	42090
Successful	15531	15531
Failures	26559	26559
Partial Successes1	5224	5224

	Main	PR
Successful	36.8995%	36.8995%
Failures	63.1005%	63.1005%

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