refator(backend-common): extract path utilities to plugin api

Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/user-settings-backend/src/database/DatabaseUserSettingsStore.ts

@@ -14,10 +14,8 @@
  * limitations under the License.
  */
 
-import {
-  PluginDatabaseManager,
-  resolvePackagePath,
-} from '@backstage/backend-common';
+import { PluginDatabaseManager } from '@backstage/backend-common';
+import { resolvePackagePath } from '@backstage/backend-plugin-api';
 import { NotFoundError } from '@backstage/errors';
 import { JsonValue } from '@backstage/types';
 import { Knex } from 'knex';