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/setup-test-folder.ts

@@ -0,0 +1,16 @@
+import { tmpdir } from 'os';
+import { join } from 'path';
+import { mkdirSync, mkdtempSync, writeFileSync } from 'fs';
+
+const baseDir = join(tmpdir(), 'n8n-tests/');
+mkdirSync(baseDir, { recursive: true });
+
+const testDir = mkdtempSync(baseDir);
+mkdirSync(join(testDir, '.n8n'));
+process.env.N8N_USER_FOLDER = testDir;
+
+writeFileSync(
+	join(testDir, '.n8n/config'),
+	JSON.stringify({ encryptionKey: 'testkey', instanceId: '123' }),
+	'utf-8',
+);