Count connection acquisition failures #594

Job	Run time
test connector (ndc-postgres-12)	2m 19s
test connector (ndc-postgres on AWS Aurora)	2m 12s
test connector (ndc-postgres-13)	2m 19s
test connector (ndc-postgres-14)	2m 47s
test connector (ndc-postgres-15)	2m 53s
test connector (ndc-postgres-16)	2m 53s
test connector (ndc-postgres on postgres)	2m 16s
test connector (ndc-postgres on citus)	2m 13s
test connector (ndc-postgres on cockroach)	3m 59s
test connector (ndc-postgres on yugabyte)	3m 5s
test unit (query-engine-execution)	2m 26s
test unit (query-engine-metadata)	33s
test unit (query-engine-sql)	35s
test unit (query-engine-translation)	4m 57s
test unit (tests-common)	6m 20s
	41m 47s

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