- Create ci/lints controller inside project/
- Move js pages to be inside projects/
- Copy view ci/lint view to be inside project folder
- Remove ci/lint view and js files

Closes #43603

Closes #28857

Same strategy with:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17810

See:
https://stackoverflow.com/a/29710188/1992201

Frankly I don't really understand how this works and I don't really
care either. However I tried it and it does the job. To try this,
make sure you have pending migrations, and run the server, hit the site.
It would tell you that there's pending migrations, and then run
migrations, and then hit the site again.

Without this patch, Rails would complain that "A copy of ...",
with this patch, it works without problems.

Closes #44483

Port of https://github.com/roidrage/lograge/pull/241

This should simplify refactoring and allow testing

This also makes the IDE generally available

This reverts commit ddeefbdd.

But first, rewrite the performance bar in Vue:

1. Remove the peek-host gem and replace it with existing code. This also allows
   us to include the host in the JSON response, rather than in the page HTML.
2. Leave the line profiler parts as here-be-dragons: nicer would be a separate
   endpoint for these, so we could use them on Ajax requests too.
3. The performance bar is too fiddly to rewrite right now, so apply the same
   logic to that.

Then, add features! All requests made through Axios are able to be tracked. To
keep a lid on memory usage, only the first two requests for a given URL are
tracked, though. Each request that's tracked has the same data as the initial
page load, with the exception of the performance bar and the line profiler, as
explained above.

This reverts merge request !17159

This is as important as SQL timings, and much more important most of the time
than GC, Redis, or Sidekiq.

Fixes attempts to update a service integration which had `can_test?`
set to true but validations were causing the "Test and save changes"
button to return "Something went wrong on our end."

Removes references to index action left from 0af99433

Integrate two workers into one ArchiveTraceWorker with pipeline_background queue. This queue takes loqer precedence than pipeline_default.