refactor: migrate to typeorm 3.0 (#8443)

* wip

* wip

* wip

* Update following.ts

* wip

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* Update resolve-user.ts

* maxQueryExecutionTime

* wip

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packages/backend/test/utils.ts

@@ -7,7 +7,6 @@ import * as childProcess from 'child_process';
 import * as http from 'http';
 import loadConfig from '../src/config/load.js';
 import { SIGKILL } from 'constants';
-import { createConnection, getConnection } from 'typeorm';
 import { entities } from '../src/db/postgre.js';
 
 const config = loadConfig();