fix(core): bring back setWorkspaceRoot util (#18811)

packages/nx/src/utils/workspace-root.ts

@@ -6,6 +6,11 @@ import { fileExists } from './fileutils';
  */
 export let workspaceRoot = workspaceRootInner(process.cwd(), process.cwd());
 
+// Required for integration tests in projects which depend on Nx at runtime, such as lerna and angular-eslint
+export function setWorkspaceRoot(root: string): void {
+  workspaceRoot = root;
+}
+
 export function workspaceRootInner(
   dir: string,
   candidateRoot: string | null