chore: add only test scripts

[UziTech]

Description

add npm scripts to only run tests with only: true set

Contributor

• [ ] Test(s) exist to ensure functionality and minimize regression (if no tests added, list tests covering this PR); or,
• [x] no tests required for this PR.
• [ ] If submitting new feature, it has been documented in the appropriate places.

Committer

In most cases, this should be a different person than the contributor.

• [ ] CI is green (no forced merge required).
• [ ] Squash and Merge PR following conventional commit guidelines.

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