Reviewers cannot edit files even when workflow.reviewer.file-edit in workflow.cfg is set to true

[AdamF42]

References

Add references/links to any related issues or PRs. These may include:

• Fixes #8957

Description

Fix the bitstream upload failure during the workflow editing process when a user is impersonating another user.

Instructions for Reviewers

The issue was caused by the missing X-On-Behalf-Of header required to handle impersonation during the file upload process.

List of changes in this PR:

• Set the X-On-Behalf-Of header with the impersonatingID in the FileUploader class.
• Added a new field, impersonatingID, to the UploaderOptions
• Updated UploaderOptions to include the impersonatingID parameter, ensuring it propagates correctly during the upload process.

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[tdonohue]

@AdamF42 : I tried testing this today and it does not solve the bug described in the linked ticket DSpace/DSpace#8957
I followed the steps in that ticket & I'm still seeing an error:

1. Login as administrator
2. Impersonate a different eperson from "Access control" administrative menu
3. Start a submission with this impersonated eperson
4. Upload a file to in progress submission (this works fine)
5. Try to download the file just added (this is where the ERROR occurs)

That said, I'm confused because this PR seems to be related to workflow reviewers? The title of this PR seems incorrect if it's supposed to fix issue 8957. Did you maybe link this up to the wrong issue ticket?

Basically, I don't understand how to test this PR. There's no clear instructions on what this is fixing and how to test that the bug is fixed.