Optimize factory usage in specs/features

What does this MR do and why?

Describe in detail what your merge request does and why.

The total running time of ./spec/features/runners_spec.rb is 73.83 seconds and it executes 5762 queries. This MR improves the factory usage.

Closes Improve slow tests in ./spec/features/runners_s... (#374086 - closed)

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Run FPROF=1 bundle exec rspec ./spec/features/runners_spec.rb and compare before/after.

MR acceptance checklist

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