fix(core): Fix migrations on non-public Postgres schema (#3356)

* 🐛 Fix UM migration

* ⚡ Account for schema in `search_path`

* 🔥 Remove unneeded schema refs

* 🧪 Account for alt schema in DB testing

* ⚡ Add schema to `IncreaseTypeVarcharLimit`

* ⚡ Set `search_path` in every migration

* ⚡ Set `search_path` in down migrations

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

@@ -24,7 +24,7 @@ import { issueJWT } from '../../../src/UserManagement/auth/jwt';
 import { getLogger } from '../../../src/Logger';
 import { credentialsController } from '../../../src/api/credentials.api';
 import type { User } from '../../../src/databases/entities/User';
-import type { EndpointGroup, SmtpTestAccount } from './types';
+import type { EndpointGroup, PostgresSchemaSection, SmtpTestAccount } from './types';
 import type { N8nApp } from '../../../src/UserManagement/Interfaces';
 import * as UserManagementMailer from '../../../src/UserManagement/email/UserManagementMailer';
 
@@ -262,3 +262,15 @@ export const categorize = <T>(arr: T[], test: (str: T) => boolean) => {
 		{ pass: [], fail: [] },
 	);
 };
+
+export function getPostgresSchemaSection(
+	schema = config.getSchema(),
+): PostgresSchemaSection | null {
+	for (const [key, value] of Object.entries(schema)) {
+		if (key === 'postgresdb') {
+			return value._cvtProperties;
+		}
+	}
+
+	return null;
+}