refactor: drop Android.mk and support for old versions of RN for new arch #407

Job	Run time
build (macos, module-legacy, java-swift)	20m 53s
build (macos, module-legacy, cpp)	19m 47s
build (macos, module-legacy, java-objc)	29m 14s
build (macos, module-mixed, cpp)	24m 24s
build (macos, module-mixed, java-objc)	27m 37s
build (macos, module-new, cpp)	24m 40s
build (macos, module-new, java-objc)	36m 49s
build (macos, view-legacy, java-objc)	27m 48s
build (macos, view-legacy, java-swift)	25m 3s
build (macos, view-mixed, java-objc)	22m 40s
build (macos, view-new, java-objc)	22m 48s
build (ubuntu, library, js)	5m 46s
build (ubuntu, module-legacy, cpp)	6m 11s
build (ubuntu, module-legacy, java-swift)	5m 51s
build (ubuntu, module-legacy, java-objc)	4m 34s
build (ubuntu, module-legacy, kotlin-swift)	4m 18s
build (ubuntu, module-legacy, kotlin-objc)	5m 18s
build (ubuntu, module-mixed, cpp)	4m 33s
build (ubuntu, module-mixed, java-objc)	4m 47s
build (ubuntu, module-mixed, kotlin-objc)	4m 57s
build (ubuntu, module-new, cpp)	5m 20s
build (ubuntu, module-new, java-objc)	4m 46s
build (ubuntu, module-new, kotlin-objc)	5m 5s
build (ubuntu, view-legacy, java-objc)	4m 26s
build (ubuntu, view-legacy, java-swift)	4m 24s
build (ubuntu, view-legacy, kotlin-swift)	4m 22s
build (ubuntu, view-legacy, kotlin-objc)	3m 40s
build (ubuntu, view-mixed, java-objc)	3m 20s
build (ubuntu, view-mixed, kotlin-objc)	4m 6s
build (ubuntu, view-new, java-objc)	3m 5s
build (ubuntu, view-new, kotlin-objc)	4m 23s
	6h 14m 55s

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