[E2E] Update API Files spec to use more complex data
What does this MR do and why?
We've had cases where files with non ascii chars, repeating patterns, and other generally 'more complex' file naming patterns have caused issues with how the system processes them.
A recent such example is Bug in file creation through API in the /projec... (#440170 - closed)
Let's update this E2E API spec to use a more complex file pattern, to help mitigate against that rather than using the most basic case.
MR acceptance checklist
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How to set up and validate locally
bundle exec rubocop -A qa/qa/specs/features/api/3_create/repository/files_spec.rb
Edited by John McDonnell