Move task operations out of onVariants to fix AGP Artifacts API confl… #11341

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	5s
diff_check / diff_check	11s
Build legacy macos production no-frameworks	5m 54s
Build legacy ios dev no-frameworks	9m 32s
Build legacy ios production dynamic-frameworks	9m 35s
Build legacy android dev no-frameworks	3m 8s
Build new android dev no-frameworks	3m 6s
Build legacy ios production no-frameworks	9m 29s
Build new ios dev no-frameworks	10m 30s
Build legacy android production no-frameworks	3m 3s
Build new android production no-frameworks	3m 6s
Build legacy macos dev no-frameworks	5m 49s
Build legacy ios dev dynamic-frameworks	9m 30s
Build new ios production no-frameworks	11m 38s
Test ${{ matrix.platform }} ${{ matrix.build-type }} REV2	0s
	1h 24m 36s

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