feat(storage): add deleteFolderRecursive sample #21611

Job	Run time
bulk-filter	1m 9s
changes	31s
windows	1m 57s
enforcer	19m 58s
units (8)	53s
gapic-libraries-bom	19m 59s
lint	40m 6s
units (25)	34s
units (21)	32s
units (17)	32s
units (11)	31s
generation-config-check	1m 9s
split-units (java-storage, 25)	3m 57s
split-units (java-storage, 8)	4m 0s
split-units (java-storage, 17)	4m 7s
split-units (java-storage, 11)	4m 27s
split-units (java-storage, 21)	3m 55s
split-clirr (java-storage)	2m 17s
split-dependencies (java-storage)	3m 28s
conditional-required-check	4s
	1h 54m 6s

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