Avoid using `allprojects` and `subprojects` #733

Job	Run time
android_emulator	9m 58s
fetch_prebuilts / Compile SQLite	10m 30s
Test watchos	15m 24s
Test macos	15m 56s
Test ubuntu	8m 35s
Test tvos	10m 22s
Test ios	14m 47s
Test windows	12m 19s
	1h 37m 51s

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