github: simplify opensips sipssert tests run #1

Job	Run time
test / setup-matrix	4s
test / test (accounting, ubuntu-latest)	1m 44s
test / test (auth, ubuntu-latest)	2m 10s
test / test (b2b, ubuntu-latest)	6m 40s
test / test (dialog, ubuntu-latest)	2m 39s
test / test (permissions, ubuntu-latest)	1m 8s
test / test (presence, ubuntu-latest)	52s
test / test (record-route, ubuntu-latest)	52s
test / test (registration, ubuntu-latest)	4m 23s
test / test (startup, ubuntu-latest)	1m 39s
test / test (stir-shaken, ubuntu-latest)	5m 1s
test / test (topology-hiding, ubuntu-latest)	2m 58s
test / test (uac-auth, ubuntu-latest)	3m 11s
	33m 21s

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