chore: Exclude tests from package

[peombwa]

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Summary

This PR excludes unit tests from packages that's produced in the release pipeline. Include the tests, which is not recommended, cause the pipeline to fail since the tests package.json in marked as private.

Motivation

Explain the motivation for making this change. What existing problem does the pull request solve?

Test plan

Demonstrate the code is solid. Example: The exact commands you ran and their output.

Closing issues

Fixes #

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.