refactor(core): Move all base URLs to UrlService (no-changelog) (#8141)

This change kept coming up in #6713, #7773, and #8135. 
So this PR moves the existing code without actually changing anything,
to help get rid of some of the circular dependencies.


## Review / Merge checklist
- [x] PR title and summary are descriptive.

packages/cli/src/environments/variables/variables.service.ee.ts

@@ -2,7 +2,7 @@ import { Container, Service } from 'typedi';
 import type { Variables } from '@db/entities/Variables';
 import { InternalHooks } from '@/InternalHooks';
 import { generateNanoId } from '@db/utils/generators';
-import { canCreateNewVariable } from './enviromentHelpers';
+import { canCreateNewVariable } from './environmentHelpers';
 import { CacheService } from '@/services/cache.service';
 import { VariablesRepository } from '@db/repositories/variables.repository';
 import type { DeepPartial } from 'typeorm';