chore: Refactor worker, emails and data cleanup to task system (#3337)

* Refactor worker, all emails on task system

* fix

* lint

* fix: Remove a bunch of expect-error comments in related tests

* refactor: Move work from utils.gc into tasks

* test

* Add tracing to tasks and processors
fix: DebounceProcessor triggering on all events
Event.add -> Event.schedule

server/queues/tasks/EmailTask.ts

@@ -0,0 +1,15 @@
+import { APM } from "@server/logging/tracing";
+import mailer, { EmailSendOptions, EmailTypes } from "../../mailer";
+import BaseTask from "./BaseTask";
+
+type Props = {
+  type: EmailTypes;
+  options: EmailSendOptions;
+};
+
+@APM.trace()
+export default class EmailTask extends BaseTask<Props> {
+  public async perform(props: Props) {
+    await mailer[props.type](props.options);
+  }
+}