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housekeeping: Default-enable geometric repacking

Patrick Steinhardt requested to merge pks-housekeeping-default-enable-geometric-repacking into master

We have rolled out geometric repacking into production systems two weeks ago now. Key observations:

- On a global scale, we see a decrease in time spent optimizing
  repositories of 15-30%.

- On a smaller scale, we see a decrease in time spent optimizing
  repositories in the gitlab-org and gitlab-com groups of 70-85%.

As geometric repacking is especially thought to be a win in large monorepositories that have a lot of activity these observations match the expectations that we have. Our gitlab-org and gitlab-com groups host two of the most active repositories that are also quite large with the gitlab and www-gitlab-com repositories, so it is expected that we see a large win there.

On the global scale the win is expected to be less significant as we tend to do full repacks more frequently in repositories with less activity now. But given that we still see a win there this seems to not be an issue.

Let's default-enable the feature flag so that we can remove it in the next release.

Part of #5031 (closed).

Edited by Patrick Steinhardt

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