perf: reduce memory usage upon running server tests (#3949)

* perf: reduce memory usage upon running server tests

* perf: plug leaks in server/routes

* perf: plug leaks in server/scripts

* perf: plug leaks in server/policies

* perf: plug leaks in server/models

* perf: plug leaks in server/middlewares

* perf: plug leaks in server/commands

* fix: missing await on db.flush

* perf: plug leaks in server/queues

* chore: remove unused legacy funcs

* fix: await on db.flush

* perf: await on GC to run in between tests

* fix: remove db refs

* fix: revert embeds

* perf: plug leaks in shared/i18n

.jestconfig.json

@@ -15,7 +15,8 @@
         "<rootDir>/server/test/setup.ts"
       ],
       "testEnvironment": "node",
-      "runner": "@getoutline/jest-runner-serial"
+      "runner": "@getoutline/jest-runner-serial",
+      "detectLeaks": true
     },
     {
       "displayName": "app",
@@ -56,6 +57,9 @@
       "setupFiles": [
         "<rootDir>/__mocks__/console.js"
       ],
+      "setupFilesAfterEnv": [
+        "<rootDir>/shared/test/setup.ts"
+      ],
       "testEnvironment": "node"
     },
     {
@@ -79,4 +83,4 @@
       }
     }
   ]
-}
+}