Bugfix to include positive and negative values ​​in the conv outputs in quantizer tests

[kawakami-masaki0]

Pull Request Description:

Bugfix to include positive and negative values ​​in the convolution outputs in quantizer tests.
Only tests for activation was modified because CICD errors occur regarding activation.

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).