fix(webpush): load user in push sub query

[TheCatLady]

Description

"Management" type notifications (e.g., Media Requested and Media Automatically Approved) are failing to send via web push due to the user relation not being loaded in the push sub query:

(node:28) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'displayName' of undefined
     at /app/dist/lib/notifications/agents/webpush.js:153:41
     at Array.map (<anonymous>)
     at WebPushAgent.send (/app/dist/lib/notifications/agents/webpush.js:150:40)
 (node:28) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 44)

Fixes issue reported by barkcollar on Discord.

Props to @danshilm for finding the root cause of this bug! 👍🏻

Screenshot (if UI-related)

N/A

To-Dos

• Successful build yarn build

Issues Fixed or Closed

• Fixes issue noted above

[sct]

❤️ Thanks

[github-actions]

🎉 This PR is included in version 1.26.0 🎉

The release is available on:

• v1.26.0
• GitHub release

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