rename gemini agent #6338

Job	Run time
build-and-check	3m 8s
test-integration-packages/billing	1m 12s
test-integration-packages/internal	1m 45s
test-integration-cli	44s
test-integration-packages/agent-runtime	42s
test-integration-web	42s
test-integration-sdk	1m 17s
test-sdk	44s
test-cli	50s
test-web	1m 14s
test-common	47s
test-integration-common	50s
test-packages/internal	56s
test-packages/agent-runtime	44s
test-packages/billing	38s
test-.agents	43s
	16m 56s

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