Add --smoke-tree-sitter flag and fail builds with empty embed #6378

Job	Run time
build-and-check	3m 4s
test-integration-packages/billing	1m 10s
test-integration-packages/agent-runtime	44s
test-integration-common	43s
test-integration-packages/internal	59s
test-integration-web	41s
test-integration-cli	40s
test-integration-sdk	1m 25s
test-common	50s
test-packages/internal	53s
test-packages/billing	51s
test-web	1m 10s
test-sdk	44s
test-packages/agent-runtime	46s
test-.agents	40s
test-cli	54s
	16m 14s

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