system: add disk usage task

src/test/common.js

@@ -14,7 +14,6 @@ const apps = require('../apps.js'),
     mailServer = require('../mailserver.js'),
     nock = require('nock'),
     path = require('path'),
-    paths = require('../paths.js'),
     settings = require('../settings.js'),
     tasks = require('../tasks.js'),
     timers = require('timers/promises'),
@@ -229,7 +228,6 @@ async function domainSetup() {
 }
 
 async function setup() {
-    await fs.promises.rm(paths.DISK_USAGE_CACHE_FILE, { force: true });
     await domainSetup();
     const ownerId = await users.createOwner(admin.email, admin.username, admin.password, admin.displayName, auditSource);
     admin.id = ownerId;