chore(durable-demo): add azd environment config

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

Author: RaviPidaparthi

sdk/agentserver/azure-ai-agentserver-invocations/samples/durable-agent-demo/.azure/demo-dev/.env

@@ -1,7 +1,7 @@
-AGENT_DURABLE_RESEARCH_AGENT_ENDPOINT="https://e2e-tests-westus2-account.services.ai.azure.com/api/projects/e2e-tests-westus2/agents/durable-research-agent/versions/21"
+AGENT_DURABLE_RESEARCH_AGENT_ENDPOINT="https://e2e-tests-westus2-account.services.ai.azure.com/api/projects/e2e-tests-westus2/agents/durable-research-agent/versions/28"
 AGENT_DURABLE_RESEARCH_AGENT_INVOCATIONS_ENDPOINT="https://e2e-tests-westus2-account.services.ai.azure.com/api/projects/e2e-tests-westus2/agents/durable-research-agent/endpoint/protocols/invocations?api-version=2025-11-15-preview"
 AGENT_DURABLE_RESEARCH_AGENT_NAME="durable-research-agent"
-AGENT_DURABLE_RESEARCH_AGENT_VERSION=21
+AGENT_DURABLE_RESEARCH_AGENT_VERSION=28
 AI_PROJECT_CONNECTION_IDS_JSON="[]"
 AI_PROJECT_DEPLOYMENTS="[{\\\"name\\\":\\\"gpt-4.1-mini\\\",\\\"model\\\":{\\\"name\\\":\\\"gpt-4.1-mini\\\",\\\"format\\\":\\\"OpenAI\\\",\\\"version\\\":\\\"2025-04-14\\\"},\\\"sku\\\":{\\\"name\\\":\\\"GlobalStandard\\\",\\\"capacity\\\":1053}}]"
 APPLICATIONINSIGHTS_CONNECTION_NAME="appInsights-connection-7543"