Remove CI features from doc page
What does this MR do and why?
This MR removes some features from our https://docs.gitlab.com/ee/ci/#features page.
- https://docs.gitlab.com/ee/ci/testing/load_performance_testing.html
- https://docs.gitlab.com/ee/ci/testing/browser_performance_testing.html
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Max Orefice