Add file-picker-max #5481

Job	Run time
build-and-check	2m 33s
test-packages/internal	45s
test-integration-.agents	47s
test-sdk	48s
test-packages/agent-runtime	58s
test-.agents	37s
test-packages/billing	46s
test-integration-cli	40s
test-common	46s
test-integration-common	40s
test-cli	1m 19s
test-integration-packages/agent-runtime	48s
test-integration-web	39s
test-integration-packages/internal	44s
test-integration-sdk	39s
test-web	44s
test-integration-packages/billing	40s
	14m 53s

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