Docs: Update experiment, beta, ga to match lowercase guidance
In the style guide, we now have this guidance: Use lowercase for beta and experiment.
This issue is to update the docs, the UI, and Pajamas with the new lowercase standard.
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Main GitLab repo - several, see below -
Omnibus - none -
Runner - gitlab-runner!4785 (merged) -
Charts - gitlab-org/charts/gitlab!3764 (merged) -
Operator - none
Edited by Suzanne Selhorn