check-invariants: Ignore some v2020 issues

We never backported the commits adding debian/apertis/component files to v2020 to avoid unnecessary churn in a stable release but this had two drawbacks:

1. pipelines that got re-triggered for any reason would fail
2. almost all v2020 package lag compared to v2021

Since we're not going to address these issues, explicitly ignore them to reduce the amount of noise on the dashboard.

Ignoring lagging packages may cause us to miss some backports, but at the moment they'd get drowned in the noise anyway.