Rename Tofa experimentation endpoint to Vertex
What does this MR do and why?
- The purpose of this API is just temporary for a subgroup of GitLab engineers to experiment with Vertex API, see: #409623 (comment 1417744663)
- By renaming it, we make it easier for others to understand what this is for. Backwards compatibility not a problem because it for internal testing only.
- As part of this change, we are also removing an unnecessary feature flag because there is already another feature flag on this endpoint #409623 (closed)
- All part of getting rid of the TOFA name once and for all
- https://gitlab.com/gitlab-org/gitlab/-/issues/408829
MR acceptance checklist
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Edited by Jessie Young