Default Client Side Evaluation feature to on

Problem to solve

Currently the Client Side evaluation feature of the Web IDE is not defaulted to on for new installations of GitLab. This means that some users may not have access to this feature.

Further details

Part of the hesitation in defaulting this feature to on was the reliance on a third party to host the required packages. With #27144 (closed) being completed, GitLab now controls a hosted version of the required packages.

Proposal

We should default this feature to on for all new GitLab installations and have them access the required packages from the GitLab hosted version of the packages.