Remove unused var in core/type_utils

[jx2lee]

Description

Remove unused top level code in core/type_utils.

Motivation and Context

None.

Testing

Not Test

Screenshots (if appropriate)

None.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Checklist

• [x] Local run of ./build.sh succeeds
• [x] Code changes have been run against the repository's pre-commit hooks
• [x] Commit messages follow Conventional Commit Specification
• [x] I have read the README document
• [x] I have added tests to cover my changes
• [x] I have run all unit tests using pytest test/unit and they are passing.

• By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.