move quickjs-sandbox into agent-runtime #3913

Job	Run time
build-and-check	2m 24s
test-backend	44s
test-cli	28s
test-npm-app	38s
test-packages/agent-runtime	33s
test-.agents	31s
test-web	30s
test-common	37s
test-integration-.agents	29s
test-integration-backend	34s
test-integration-cli	32s
test-integration-common	38s
test-integration-web	36s
test-integration-npm-app	29s
test-integration-packages/agent-runtime	38s
	10m 21s

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