[Test] add environment variables that is needed by samples

to fix samples run in live tests.  It would have been nicer if the same set of
variables are used for both tests and samples. However this is a simple and
straightforward fix.

sdk/cognitivelanguage/ai-language-conversations/tests.yml

@@ -11,3 +11,10 @@ extends:
         LANGUAGE_CLU_DEPLOYMENT_NAME: $(clu-project-deployment)
         LANGUAGE_ORCHESTRATION_PROJECT_NAME: $(clu-workflow-project)
         LANGUAGE_ORCHESTRATION_DEPLOYMENT_NAME: $(clu-workflow-project-deployment)
+        # The following are for samples
+        AZURE_CONVERSATIONS_ENDPOINT: $(clu-uri)
+        AZURE_CONVERSATIONS_KEY: $(clu-key)
+        AZURE_CONVERSATIONS_PROJECT_NAME: $(clu-project)
+        AZURE_CONVERSATIONS_DEPLOYMENT_NAME: $(clu-project-deployment)
+        AZURE_CONVERSATIONS_WORKFLOW_PROJECT_NAME: $(clu-workflow-project)
+        AZURE_CONVERSATIONS_WORKFLOW_DEPLOYMENT_NAME: $(clu-workflow-project-deployment)