telemetry: Point DSN to gitlab-org/gitlab-development-kit

What does this merge request do and why?

We've been using error tracking as a test, but the error where not sent to the canonical project. Now we're through the test phase and we make the errors end up in gitlab-org/gitlab-development-kit.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Start an irb:

   irb -I lib -I lib/gdk -r shellout -r gdk

2. Run a Shellout command that fails:

   Shellout.new("echo 'This failed'>&2 && false").execute

3. Check https://gitlab.com/gitlab-org/gitlab-development-kit/-/error_tracking if the error popped up.

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.