Add Accept-Encoding identity header for file stream requests

Rodrigo Tomonarirequested to merge
rodrigo/no-encoding-for-stream-requests into master

What does this MR do and why?

Prevent source instances from automatic compression of files downloaded from importers when using stream body by setting Accept-Encoding to 'identity'. This should avoid decompression failures when files exceed Gitlab::CurrentSettings.max_http_decompressed_size limit, which has been added as a security measure.

For context, importers make stream requests to download typically large files. Therefore, the response should avoid using content-encoding: gzip, as Rails would consume excessive memory decompressing the files. This is because Net/HTTP decompresses the response and stores it in memory.

References

https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/4786#note_2659236543

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Edited by Rodrigo Tomonari

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