Restrict imports on the form ../../plugins/x/src

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

packages/config/src/reader.test.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { withLogCollector } from '../../test-utils-core/src';
+import { withLogCollector } from '@backstage/test-utils-core';
 import { ConfigReader } from './reader';
 
 const DATA = {