Draft: Add browser version and headless env vars
What does this MR do and why?
Adds browser_version
and webdriver_headless
environment variables for grid testing.
Relates to https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116158
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 James Nutt