chore: Enfore consistent file-name casing on all backend packages (#15755)

packages/@n8n/di/.eslintrc.js

@@ -4,4 +4,7 @@ const sharedOptions = require('@n8n/eslint-config/shared');
 module.exports = {
 	extends: ['@n8n/eslint-config/base'],
 	...sharedOptions(__dirname),
+	rules: {
+		'unicorn/filename-case': ['error', { case: 'kebabCase' }],
+	},
 };

packages/@n8n/di/src/__tests__/circular-depedency.test.ts

@@ -1,5 +1,5 @@
-import { ServiceA } from './fixtures/ServiceA';
-import { ServiceB } from './fixtures/ServiceB';
+import { ServiceA } from './fixtures/service-a';
+import { ServiceB } from './fixtures/service-b';
 import { Container } from '../di';
 
 describe('DI Container', () => {

packages/@n8n/di/src/__tests__/fixtures/service-a.ts

@@ -1,5 +1,5 @@
 // eslint-disable-next-line import/no-cycle
-import { ServiceB } from './ServiceB';
+import { ServiceB } from './service-b';
 import { Service } from '../../di';
 
 @Service()

packages/@n8n/di/src/__tests__/fixtures/service-b.ts

@@ -1,5 +1,5 @@
 // eslint-disable-next-line import/no-cycle
-import { ServiceA } from './ServiceA';
+import { ServiceA } from './service-a';
 import { Service } from '../../di';
 
 @Service()