Avoid nested spector scenarios

Is there a reason that this scenario needs to be nested under another scenario - https://github.com/Azure/typespec-azure/tree/main/packages/azure-http-specs/specs/client/naming/enum-conflict? This doesn't appear to follow the existing convention where specs are only found at leaf nodes.

Start by inspecting packages/azure-http-specs/specs/client/naming/enum-conflict and its parent scenario to understand why it is nested. Compare the layout with nearby specs and the existing leaf-node convention; done means the nesting is either justified or the scenario follows that convention without breaking the spec structure.

Written by the indexing model from the issue text.