feat(storage): add deleteFolderRecursive sample #19846

Job	Run time
gapic-bom	1m 51s
gitignore_correctness	1m 10s
root-pom	1m 53s
owlbot-yaml	1m 28s
owlbot-py	1m 38s
group_id_check_for_maps_libraries	9m 54s
generate-readme	1m 11s
package_name_check	1m 10s
	20m 15s

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