fix: ci: app location no longer breaks release CI pipeline

[manusa]

Description

It seems that the location of the app that was added in #2026 is breaking the Update and release CI pipeline (logs).

> electron-apps@1.9312.0 release
> script/release.sh

set -o errexit    # always exit on error
set -o pipefail   # honor exit codes when piping
set -o nounset    # fail on unset variables

git clone "***github.com/electron/apps" app
fatal: destination path 'app' already exists and is not an empty directory.
Error: Process completed with exit code [12](https://github.com/electron/apps/actions/runs/3540390063/jobs/5943382201#step:3:13)8.

It's likely that there is something else that's breaking the pipeline since it started failing a month before this PR was merged, but this is for sure breaking it (even more).

This PR moves the app metadata to a more convenient location.