Refactor tenant ORM integration (#1650)

* Refactor tenant ORM integration

* fix tests

server/src/tenant/metadata/metadata.controller.spec.ts

@@ -0,0 +1,37 @@
+import { Test, TestingModule } from '@nestjs/testing';
+
+import { MetadataController } from './metadata.controller';
+
+import { DataSourceService } from './data-source/data-source.service';
+import { DataSourceMetadataService } from './data-source-metadata/data-source-metadata.service';
+import { EntitySchemaGeneratorService } from './entity-schema-generator/entity-schema-generator.service';
+
+describe('MetadataController', () => {
+  let controller: MetadataController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [MetadataController],
+      providers: [
+        {
+          provide: DataSourceService,
+          useValue: {},
+        },
+        {
+          provide: DataSourceMetadataService,
+          useValue: {},
+        },
+        {
+          provide: EntitySchemaGeneratorService,
+          useValue: {},
+        },
+      ],
+    }).compile();
+
+    controller = module.get<MetadataController>(MetadataController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});