Investigate long running examples in frontend fixture rspec

The frontend:fixtures task duration increased from 3m40s (2019-12-01) to 10m43s (2020-02-17)

date job number of fixture spec duration
2019-12-01 https://gitlab.com/gitlab-org/gitlab/-/jobs/365863396 70 examples 3 minutes 39.6 seconds
2020-01-01 https://gitlab.com/gitlab-org/gitlab/-/jobs/391892346 85 examples 6 minutes 8 seconds
2020-02-01 https://gitlab.com/gitlab-org/gitlab/-/jobs/439277170 88 examples 10 minutes 24 seconds
2020-02-17 https://gitlab.com/gitlab-org/gitlab/-/jobs/439791961 88 examples 10 minutes 43 seconds

We need to investigate why 3 examples added more than 4 minutes to the duration and find out if it can be optimized.

The frontend-fixtures job duration is tracked in https://app.periscopedata.com/app/gitlab/496118/Engineering-Productivity-Sandbox?widget=7910143&udv=833427

/cc @gl-quality/eng-prod

Edited by Albert Salim