Webpack warning/error after enabling maintenance mode when accessing administration page
## Overview
When I enable maintenance mode, and refresh the adminstration -\> General page, I get the following warning/error message. Everytime I navigate to this page, this comes up.
This happened on a brand new install of GDK from last night, all i did was access the UI to try enabling maintenance mode.
Also got this screenshot from someone on my team:
```
Just checked the chrome console and it looks like we're doing some POST request to /api/v4/usage_data/track_event which fails? I wonder if that's getting blocked by maintenance mode and the unhandled error is messing other things up.. That error goes away if you turn off maintenance mode.
```
{width=720 height=375}

## Impacted categories
The following categories relate to this issue:
- [x] gitlab-development-kit~26083594 - e.g. When a GDK action fails to complete.
- [ ] gitlab-development-kit~26083878 - e.g. Improvements or suggestions around how the GDK functions.
- [ ] gitlab-development-kit~26083593 - e.g. When a GDK action is slow or times out.
## Steps to replicate (optional)
<!--Clear steps of how to replicate the issue.-->
1. Enable maintenance mode in the UI on the primary
2. Refresh or try to navigate again to the administration page.
## Proposal (optional)
<!--Description of any proposal you might have.-->
## Environment (optional)
- Operating system name: ``<!-- output of `uname -a` command -->``
- Architecture: ``<!-- output of `arch` command -->``
- The contents of your `gdk.yml` (if any)
- Ruby version: ``<!-- output of `ruby --version` command -->``
- GDK version: ``<!-- output of `git rev-parse --short HEAD` command -->``
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