Remove power down and restart buttons

[jonahkagan]

Overview

Closes #5214

• Remove power down button from all apps except VxScan. Every other app has a physical power button, so this on-screen button is unnecessary.
• Remove restart button from error boundary screen. The error boundary is mostly triggered by server crashes, in which case the restart button doesn't actually work (since it goes through the server).

Demo Video or Screenshot

Testing Plan

Updated automated tests

Checklist

• I have added logging where appropriate to any new user actions, system updates such as file reads or storage writes, or errors introduced.

• I have added a screenshot and/or video to this PR to demo the change
• I have added the "user_facing_change" label to this PR to automate an announcement in #machine-product-updates

[adghayes]

In the app.tsx pages, we now have two identical error boundaries, one inside the ApiProvider and one outside. I recommend removing the ones inside the ApiProviders. I added those purely to have an error boundary with access to the API, for the purpose of rebooting, but now that's no longer necessary.

[jonahkagan]

In the app.tsx pages, we now have two identical error boundaries, one inside the ApiProvider and one outside. I recommend removing the ones inside the ApiProviders. I added those purely to have an error boundary with access to the API, for the purpose of rebooting, but now that's no longer necessary.

Thanks for this context. I was wondering why there were two error boundaries. Will update