Remove automatic external knapsack report volume mount

andreyrequested to merge
andrey-remove-knapsack-volue into master

What does this MR do and why?

Knapsack report is now committed in to the repository itself so there is no need to have a volume to mount it externally. This will fix failures like this: https://gitlab.com/gitlab-org/omnibus-gitlab/-/jobs/8849114934

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