Remove last bits of `single_file_file_by_file` feature flag
What does this MR do and why?
For #430116 (closed)
This feature flag has already been mostly removed (from use), but this removes the last bits of it:
- The code that allowed checking for it in Ruby
- The YML itself
Screenshots or screen recordings
All backstage
MR acceptance checklist
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Edited by Thomas Randolph