Fix rat check errors during release process

[andygrove]

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

[hsiang-c]

take

[andygrove]

fixed in https://github.com/apache/datafusion-comet/pull/1689