Allow mounting knapsack report from host

What does this MR do and why?

Describe in detail what your merge request does and why.

This update allows mounting knapsack report from host instead of fetching it within the test container itself

Part of: https://gitlab.com/gitlab-org/gitlab/-/issues/361733

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.