Automate Uploading MV3 build zips on the Releases pages from github

[seaona]

What: need to upload automatically MV3 builds on the Assets section from the Releases page.

How: from @danjm 's comment: for the build to appear here, we need to modify metamask-extension/.circleci/scripts/release-create-gh-release.sh

Details to add:

• exact specifications for workflow: push commit to RC, after beta build jobs there should be a release post job for the beta version
• determine how changelogs should work for beta versions (e.g. should a beta version contain the full versions changelog when it is first created? should the final version reference the intitial beta version changelog). Also, how to do changelog review / validation for beta changelogs?

[danjm]

Hey team! Please add your planning poker estimate with Zenhub @pedronfigueiredo @brad-decker @DDDDDanica @PeterYinusa

[danjm]

Please add your planning poker estimate with Zenhub @tmashuang

[danjm]

this should be for chrome builds only