[native_assets_builder] Support pub workspaces 3 #1212

Job	Run time
build (ubuntu, stable, native_assets_builder, false)	6m 7s
build (ubuntu, stable, native_assets_cli, false)	2m 5s
build (ubuntu, stable, native_toolchain_c, false)	2m 7s
build (ubuntu, dev, native_assets_builder, false)	6m 20s
build (ubuntu, dev, native_assets_cli, false)	2m 19s
build (ubuntu, dev, native_toolchain_c, false)	2m 4s
build (macos, stable, native_assets_builder, false)	5m 32s
build (macos, stable, native_assets_cli, false)	1m 32s
build (macos, stable, native_toolchain_c, false)	1m 59s
build (macos, dev, native_assets_builder, false)	6m 43s
build (macos, dev, native_assets_cli, false)	1m 36s
build (macos, dev, native_toolchain_c, false)	2m 15s
build (windows, stable, native_assets_builder, false)	9m 14s
build (windows, stable, native_assets_cli, false)	3m 6s
build (windows, stable, native_toolchain_c, false)	5m 37s
build (windows, dev, native_assets_builder, false)	8m 6s
build (windows, dev, native_assets_cli, false)	3m 6s
build (windows, dev, native_toolchain_c, false)	5m 25s
coverage-finished	4s
	1h 15m 17s

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