[19.2.x] Unified release process

[eps1lon]

Backports #36456 to allow releasing 19.2.x from CI

test plan

Test release from the head of releases/19.2.x

$ yarn --cwd scripts/release install --frozen-lockfile
$ GH_TOKEN=$(gh auth token) scripts/release/prepare-release-from-ci.js --skipTests -r latest --commit=750848e565bb657a4759cf7f6efb17fb82e674a6
$ scripts/release/publish.js --tag latest --dry
react 19.2.6 has already been published.
react-art 19.2.6 has already been published.
react-dom 19.2.6 has already been published.
react-server-dom-webpack 19.2.6 has already been published.
react-server-dom-turbopack 19.2.6 has already been published.
react-server-dom-parcel 19.2.6 has already been published.
react-is 19.2.6 has already been published.
react-reconciler 0.33.0 has already been published.
react-refresh 0.18.0 has already been published.
react-test-renderer 19.2.6 has already been published.
use-subscription 1.12.0 has already been published.
use-sync-external-store 1.6.0 has already been published.
scheduler 0.27.0 has already been published.
$ scripts/release/publish.js --tag latest --dry --onlyPackages react
react 19.2.6 has already been published.