Update gitlab-experiment gem to v0.8.0
What does this MR do and why?
Re-release of v0.8.0 gem in GitLab, see original in !113990 (merged)
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.
Related to #416671 (closed)
Edited by Serhii Yarynovskyi