Fix rat check errors during release process #1678
Description
Describe the bug
The rat exclude list needs updating to ignore these files:
NOT APPROVED: docs/source/_static/images/comet-dataflow.excalidraw (apache-datafusion-comet-0.8.0/docs/source/_static/images/comet-dataflow.excalidraw): false
NOT APPROVED: native/core/testdata/backtrace.txt (apache-datafusion-comet-0.8.0/native/core/testdata/backtrace.txt): false
NOT APPROVED: native/core/testdata/stacktrace.txt (apache-datafusion-comet-0.8.0/native/core/testdata/stacktrace.txt): false
Steps to reproduce
No response
Expected behavior
No response
Additional context
No response