Add log splitter for CI rspec failed examples

Open username-removed-864731 requested to merge innerwhisper/gitlab-ce:add_log_splitter into master

What does this MR do?

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

It helps to work:

  • with flaky tests: with it we can catch errors in test environment logs
  • with any failed specs: we can analyze them using CI artifacts

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Edited by username-removed-864731