refactor(core): Abstract away InstanceSettings and encryptionKey into injectable services (no-changelog) (#7471)

This change ensures that things like `encryptionKey` and `instanceId`
are always available directly where they are needed, instead of passing
them around throughout the code.

packages/cli/test/integration/shared/utils/index.ts

@@ -1,7 +1,5 @@
 import { Container } from 'typedi';
-import { randomBytes } from 'crypto';
-import { existsSync } from 'fs';
-import { BinaryDataService, UserSettings } from 'n8n-core';
+import { BinaryDataService } from 'n8n-core';
 import type { INode } from 'n8n-workflow';
 import { GithubApi } from 'n8n-nodes-base/credentials/GithubApi.credentials';
 import { Ftp } from 'n8n-nodes-base/credentials/Ftp.credentials';
@@ -84,19 +82,6 @@ export async function initBinaryDataService(mode: 'default' | 'filesystem' = 'de
 	Container.set(BinaryDataService, binaryDataService);
 }
 
-/**
- * Initialize a user settings config file if non-existent.
- */
-// TODO: this should be mocked
-export async function initEncryptionKey() {
-	const settingsPath = UserSettings.getUserSettingsPath();
-
-	if (!existsSync(settingsPath)) {
-		const userSettings = { encryptionKey: randomBytes(24).toString('base64') };
-		await UserSettings.writeUserSettings(userSettings, settingsPath);
-	}
-}
-
 /**
  * Extract the value (token) of the auth cookie in a response.
  */