Update frontend testing feature tests docs
What does this MR do and why?
This MR updates the frontend testing feature tests docs to remove examples of poor practises and link to best practises
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 Coung Ngo