Avoid failing pull mirroring if LFS import fails

What does this MR do?

Refs https://gitlab.com/gitlab-org/gitlab-ce/issues/61834

It seems there are several scenarios where the LFS import operation during pull mirroring fails. In order to avoid failing the whole mirror operation, while we analyze those scenarios, we are removing that restriction and let it succeed.

We're also adding some logging data in order to analyze them later.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content