chore: Renaming Covered Experience to User Experience SLI

Hercules Merscherrequested to merge
user-experience-sli-rename into main

What

Rename of covered experience(s) to user experience SLI(s).

Why

We are moving away from the term "Covered Experience" for SLIs, as part of team#4347 (closed).

LabKit update: https://gitlab.com/gitlab-org/ruby/gems/labkit-ruby/-/releases/v0.42.2.

Links to relevant issues

Edited by Hercules Merscher

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