chore(misc): fix failing remove unit tests (#23373)

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## Current Behavior
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Fixes #

packages/workspace/src/generators/remove/lib/update-tsconfig.spec.ts

@@ -38,6 +38,11 @@ describe('updateTsconfig', () => {
       forceRemove: false,
       importPath: '@proj/whatever-name',
     };
+
+    graph = {
+      nodes: {},
+      dependencies: {},
+    };
   });
 
   it('should delete project ref from the root tsconfig.base.json', async () => {