Add test for sequential serial number gaps #5484

Job	Run time
Waiting for build / Waiting For Build	7m 45s
OCSP with self certificate verification test	8m 26s
Basic OCSP / Test	5m 11s
OCSP clone / Test	8m 56s
OCSP with existing config / Test	5m 38s
OCSP with external certs / Test	4m 48s
OCSP on separate instance / Test	4m 39s
OCSP with CMC / Test	4m 41s
OCSP with direct CRL publishing / Test	5m 51s
OCSP container / Test	6m 14s
OCSP with LDAP-based CRL publishing / Test	6m 26s
OCSP with HSM / Test	4m 33s
Standalone OCSP / Test	4m 2s
	1h 17m 10s

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