wip: test: multik8s: improve test for multi-controller env #1445

Job	Run time
build (1.35.1, 3Mi, !//)	48m 2s
build (1.35.1, 3Mi, backup-failure)	36m 40s
build (1.35.1, 10Mi, various-transfer-part-size)	23m 20s
build (1.35.1, 3Mi, incr-backup)	39m 9s
build (1.35.1, 3Mi, multi-controller)	24m 20s
build (1.35.1, 3Mi, change-to-primary)	32m 5s
build (1.35.1, 200Gi, various-transfer-part-size)	23m 38s
build (1.34.4, 3Mi, full-backup)	34m 26s
build (1.35.1, 3Mi, lock)	25m 55s
build (1.35.1, 3Mi, full-backup)	36m 54s
build (1.35.1, 3Mi, change-to-standalone)	23m 50s
build (1.35.1, 3Mi, change-to-secondary)	31m 7s
	6h 19m 26s

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