chore: Remove unused clients in admin + clean up js-sdk #29724

Job	Run time
setup	4m 43s
integration-tests-packages	9m 16s
Shard (0) HTTP Integration Tests	8m 1s
Shard (0) Unit Tests	7m 31s
Shard (0) Module Integration Tests	8m 50s
Shard (1) HTTP Integration Tests	6m 17s
Shard (1) Unit Tests	5m 31s
Shard (1) Module Integration Tests	7m 35s
unit-tests	1s
integration-tests-http	1s
integration-tests-modules	1s
	57m 47s

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