Add specs for ListOrgsV2 and DeleteUserInvitations #17420

Job	Run time
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 18s
pre-commit / pre-commit	1m 6s
test / test (2.7, ubuntu-latest)	3m 1s
test / test (3.2, ubuntu-latest)	2m 30s
examples / examples	2m 41s
report	8s
	12m 44s

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