Remove live-audio-transcription-example sample (moved to PR #672)

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

Author: ruiren_microsoft

samples/rust/Cargo.toml

@@ -4,7 +4,6 @@ members = [
     "tool-calling-foundry-local",
     "native-chat-completions",
     "audio-transcription-example",
-    "live-audio-transcription-example",
     "tutorial-chat-assistant",
     "tutorial-document-summarizer",
     "tutorial-tool-calling",