test: use fully qualified request type name in tests (#407)

* test: use fully qualified request type name in tests

PiperOrigin-RevId: 475685359

Source-Link: https://github.com/googleapis/googleapis/commit/7a129736313ceb1f277c3b7f7e16d2e04cc901dd

Source-Link: https://github.com/googleapis/googleapis-gen/commit/370c729e2ba062a167449c27882ba5f379c5c34d
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