[infra] Remove auto_assign_reviewers option from .coderabbit.yaml (NVIDIA#6490)

Signed-off-by: Venky <[email protected]>
Signed-off-by: Lanyu Liao <[email protected]>

Author: venkywonka

.coderabbit.yaml

@@ -28,7 +28,6 @@ reviews:
   related_prs: true
   suggested_labels: true
   suggested_reviewers: true
-  auto_assign_reviewers: true
   poem: false
   auto_review:
     drafts: true