Add test for pki-server instance-externalcert-add/del #8804

Job	Run time
Waiting for build / Waiting For Build	1m 39s
Basic CA / Test	3m 52s
CA with ECC / Test	3m 9s
CA with existing certs / Test	2m 56s
CA with existing config / Test	4m 23s
CA with existing DS / Test	3m 5s
CA with existing NSS database / Test	3m 8s
CA with existing HSM / Test	3m 7s
CA admin user / Test	3m 32s
CA with RSA/PSS / Test	3m 6s
CA with RSA / Test	3m 22s
CA with custom ports / Test	4m 37s
CA with CMC shared token / Test	3m 44s
CA with custom user / Test	2m 54s
CA connection with DS / Test	6m 48s
CA with HSM / Test	3m 27s
CA database pruning / Test	9m 0s
CA with RSNv1 / Test	3m 43s
CA with SSNv1 / Test	6m 31s
CA with SSNv2 / Test	4m 59s
	1h 21m 2s

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