Port custom DisposableStack polyfills and simplify build scripts #275

Job	Run time
expo-smoke (24)	1m 44s
ci (25)	1m 27s
relay-runtime-smoke (25, bun)	31s
ci (24)	1m 30s
integrations-smoke (24, tauri)	40s
integrations-smoke (25, tanstack-start)	43s
relay-runtime-smoke (25, node)	32s
integrations-smoke (24, astro)	35s
integrations-smoke (25, tauri)	44s
integrations-smoke (25, astro)	42s
relay-runtime-smoke (24, node)	28s
relay-runtime-smoke (24, bun)	31s
coverage-lane	42s
integrations-smoke (24, tanstack-start)	37s
	11m 26s

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