[Core] Support custom executor qualname (#23314)

Signed-off-by: 22quinn <33176974+22quinn@users.noreply.github.com>

.buildkite/test-pipeline.yaml

@@ -244,6 +244,7 @@ steps:
     - pytest -v -s v1/core
     - pytest -v -s v1/engine
     - pytest -v -s v1/entrypoints
+    - pytest -v -s v1/executor
     - pytest -v -s v1/sample
     - pytest -v -s v1/logits_processors
     - pytest -v -s v1/worker