chore: reject external auth early#17712

ThomasK33 merged 1 commit intothomask33/05-06-feat_add_api_key_scope_for_workspace_agents_to_support_running_without_user_data_accesscoder/coder:thomask33/05-06-feat_add_api_key_scope_for_workspace_agents_to_support_running_without_user_data_accessfrom

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