Code review comment for ~xnox/ubuntu-release-upgrader:ignore-base-tasks

I think this change is a bit too intrusive for an SRU from testing/assessing the potential regressions POV and also does not fully resolve the redundancy between tasks and meta packages, just special-cases two of them.

I think the minimal fix of skipping just systemd-timesyncd either in u-r-u or in the seed generation for focal only would be a more appropriate to limit the impact.

For groovy and later I think the task generation should be changed to not pull in dependencies to tasks and as a result u-r-u could keep handling tasks the way they used to be handled.

I'm OK with picking this change and SRU-ing it because the change is not wronk, but I think it is between a minimal fix and a general solution and this makes it not optimal in my eyes.