ReproNxWorkspaceRuleWithFlatConfig

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How the repro was created :

• create a workspace, typescript, node, single server, vanilla
• nx run-many -t lint --all => ✅
• nx generate @nx/eslint:convert-to-flat-config => ✅
• nx run-many -t lint --all => ✅
• nx generate @nx/eslint:workspace-rule --name "demoRule" => ✅
• nx run-many -t lint --all => ❌

Fails with TypeError: Key "rules": Key "@nx/workspace/demoRule": Could not find plugin "@nx/workspace"..