Remove thinker-with-files-gemini from freebuff #6104

Job	Run time
build-and-check	2m 52s
test-integration-packages/billing	1m 8s
test-integration-packages/internal	1m 12s
test-integration-sdk	1m 21s
test-packages/agent-runtime	48s
test-integration-packages/agent-runtime	46s
test-.agents	49s
test-cli	1m 0s
test-integration-common	44s
test-packages/internal	54s
test-integration-web	39s
test-integration-cli	42s
test-web	2m 18s
test-packages/billing	40s
test-common	39s
test-sdk	46s
	17m 18s

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