Remove check for import_project_from_remote_file_s3 feature flag
What does this MR do and why?
This change removes the check for the check for the import_project_from_remote_file_s3
feature flag from remote_file import as there are cases where a user needs to use a pre-signed S3 URL to import, which is not possible using remote_file_s3.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #384051 (closed)