use correct gradle packageTask and asserts dir for android libraries

[Legion2]

Summary

Fixes #29577 and react-native-community/upgrade-support#93, when building an android library the package task has a different name, which was not handled correctly in the react.gradle file. The fix uses the existing packageTask variable which is correctly set for applications and libraries. This PR also copies the bundled js file into the correct assets directory, which is different from the assets directory of applications.

Changelog

[Android] [Fixed] - Fixed Android library builds with react.gradle file

Test Plan

Tested with my android library build which includes the react.gradle file and the build succeeded.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 6daf5bb

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	9,244,077	+0
android	hermes	armeabi-v7a	8,756,540	+0
android	hermes	x86	9,688,826	+0
android	hermes	x86_64	9,655,721	+0
android	jsc	arm64-v8a	10,880,195	+0
android	jsc	armeabi-v7a	9,783,936	+0
android	jsc	x86	10,920,336	+0
android	jsc	x86_64	11,528,751	+0

Base commit: 6daf5bb

[facebook-github-bot]

@ShikaSD has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[cortinico]

Thank you for the fix @Legion2 The change looks good and should be merged soon 👍

[facebook-github-bot]

@cortinico merged this pull request in 88f0676.