wip: test: improvement #1375

Job	Run time
build (1.35.1, 3Mi, lock)	24m 17s
build (1.35.1, 3Mi, change-to-secondary)	27m 19s
build (1.35.1, 3Mi, full-backup)	34m 51s
build (1.35.1, 3Mi, change-to-standalone)	24m 6s
build (1.35.1, 3Mi, incr-backup)	39m 13s
build (1.35.1, 10Mi, various-transfer-part-size)	20m 20s
build (1.35.1, 200Gi, various-transfer-part-size)	19m 41s
build (1.34.4, 3Mi, full-backup)	35m 50s
build (1.35.1, 3Mi, backup-failure)	37m 3s
build (1.35.1, 3Mi, change-to-primary)	28m 9s
build (1.35.1, 3Mi, !//)	46m 54s
	5h 37m 43s

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