[tor-project] TPA-RFC-48: Enable new GitLab Web IDE

[Jérôme Charaoui]

Summary: enable the new VSCode-based GitLab Web IDE, currently in beta, 
as the default in our GitLab instance

# Background

The current Web IDE has been the cause of some of the woes when working 
with the blog. The main problem was that is was slow to load some of the 
content of the in the project repository, and in some cases even 
crashing the browser.

The [new Web IDE][] announced a few months ago is now available in the 
version of GitLab we're running, and initial tests with it seem very 
promising. The hope is that it will be much faster than its predecessor, 
and using it will eliminate one of the pain points identified by Tor 
people who regularly work on the blog.

[new Web IDE]: 
https://about.gitlab.com/blog/2022/05/23/the-future-of-the-gitlab-web-ide/

# Proposal

Make the new Web IDE the default by enabling the `vscode_web_ide` 
feature flag in GitLab.

## Affected users

All GitLab users.

## Alternatives

Users who wish to continue using the old version of the Web IDE may 
continue to do so, by [adjusting their preferences][].

The removal of the old Web IDE is currently planned for the 16.0 
release, which is due in May 2023.

[adjusting their preferences]: 
https://docs.gitlab.com/ee/user/project/web_ide_beta/index.html#stop-using-the-web-ide-beta

# Approval

Needs approval from TPA.

# Deadline

The setting is currently enabled. Feedback on this RFC is welcome until 
Tuesday, February 28, at which point this RFC will transition to the 
`adopted` state unless decided otherwise.

# Status

This proposal is currently in the `proposed` state.

# References

  * [GitLab documentation about the new Web IDE][]
  * discussion ticket: [tpo/web/lego#51][]

[GitLab documentation about the new Web IDE]: 
https://docs.gitlab.com/ee/user/project/web_ide_beta/index.html#use-the-web-ide-beta

[tpo/web/lego#51]: https://gitlab.torproject.org/tpo/web/lego/-/issues/51