Upgrade to electron 12 and Node 14

- Compute cluster ID for tests
- Switch to temporary appData path while testing
Signed-off-by: Sebastian Malton <sebastian@malton.name>
Co-authored-by: Sebastian Malton <smalton@mirantis.com>
Co-authored-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>