feat: add include_drafts query parameter to listAgentVersions

Adds an optional boolean query parameter 'include_drafts' (default: false)
to the list agent versions endpoint. When false, only non-draft versions
are returned. When true, both draft and non-draft versions are included.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: akaila

specification/ai-foundry/data-plane/Foundry/src/agents/routes.tsp

@@ -192,6 +192,9 @@ interface Agents {
       @path agent_name: string;
 
       ...CommonPageQueryParameters;
+
+      /** Whether to include draft versions in the listing. Defaults to false (only non-draft versions are returned). */
+      @query include_drafts?: boolean = false;
     },
     AgentsPagedResult<AgentVersionObject>
   >;