Deploy the WikimediaApiPortalOAuth extension to the API Portal production site
[x] Add the new extension submodule to the git mediawiki/extensions repo https://gerrit.wikimedia.org/r/c/mediawiki/extensions/+/589906
[x] Code Review.
[x] Security Review T254947
[x] Performance review T254950
[x] Move extension CI config to wikimedia-deployed section https://gerrit.wikimedia.org/r/c/integration/config/+/644302/
[x] Add extension to the make-wmf-branch release tool https://gerrit.wikimedia.org/r/c/mediawiki/tools/release/+/608687
[x] Deploy on beta sites
[x] Add extension to extension-list
[x] Load extension in mediawiki-config
[x] Enable on apiportalwiki https://gerrit.wikimedia.org/r/c/operations/mediawiki-config/+/644305/
[] Update https://www.mediawiki.org/wiki/Extension:WikimediaApiPortalOAuth accordingly ("Release status" etc)
[] Enable experimental endpoints on Extension:OAuth on Meta https://gerrit.wikimedia.org/r/644547