Enable Support for 'arm64-v8a' in Android's Gradle Configuration

[SiobhyB]

gutenberg: WordPress/gutenberg#36007

At the moment, anyone running on an M1 Mac who wishes to run Gutenberg's demo app for Android would need to manually add support for arm64-v8a.

With this PR, support is enabled by default, by adding arm64-v8a to abiFilters in the project's Gradle configuration.

To test: Please refer to the Gutenberg PR as the central, most up-to-date place for testing instructions.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[oguzkocer]

@SiobhyB Do you mind pinging a gb-mobile developer for this review? I can approve it if you'd like because the linked PR looks good to me, but this PR includes more changes than the abiFilters change so it might be better if a gb-mobile developer takes a look instead.

[SiobhyB]

Thanks, @oguzkocer, that makes sense! @twstokes has kindly offered his help here :D

[twstokes]

LGTM @SiobhyB! 🎉 Thanks so much for getting this change in! I was able to run the demo project from my M1 Mac.

I will add one note: My Mac carries over my previous configuration changes that you mentioned here, so this wasn't tested with a purely clean fresh start, but this comment makes me think those steps may not be necessary anymore.

[peril-wordpress-mobile]

Wanna run full suite of Android and iOS UI tests? Click here and 'Approve' CI job!

[SiobhyB]

Due to frozen tests following a CircleCI outage, I haven't been able to merge this PR yet. In the process of waiting, a new PR with a more recent Gutenberg ref has been created at #4173. To avoid conflicts, I'll close this PR to make way for that newer PR, which will pick up these changes.