FileTransformer saves against lfs_storage_project

What does this MR do?

In a fork network, LfsObjects saved using the FileTransformer previously would have the project denied access to them when LfsObject#project_allowed_access? was checked.

This changes LfsObject#project_allowed_access? to return true for all members of a fork network.

Also, see discussion in the gitlab-foss MR gitlab-foss!31224 (closed).

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers