qa app and eval app configs (#8471)

GitOrigin-RevId: 8a8ba714f3242d9e1b3a7cafffc2e6dd09c499d9

Author: berkecanrizai

examples/pipelines/demo-question-answering/app.yaml

@@ -39,8 +39,8 @@ $embedder: !pw.xpacks.llm.embedders.OpenAIEmbedder
 $splitter: !pw.xpacks.llm.splitters.TokenCountSplitter
   max_tokens: 400
 
-$parser: !pw.xpacks.llm.parsers.UnstructuredParser
-  cache_strategy: !pw.udfs.DefaultCache
+$parser: !pw.xpacks.llm.parsers.DoclingParser
+  async_mode: "fully_async"
 
 $retriever_factory: !pw.stdlib.indexing.UsearchKnnFactory
   reserved_space: 1000