refactor: remove all unused imports (#9951)

Co-authored-by: tamaina <tamaina@hotmail.co.jp>

packages/backend/src/core/entities/AntennaEntityService.ts

@@ -1,7 +1,6 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
 import type { AntennaNotesRepository, AntennasRepository } from '@/models/index.js';
-import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { Packed } from '@/misc/schema.js';
 import type { Antenna } from '@/models/entities/Antenna.js';
 import { bindThis } from '@/decorators.js';