fix: Refactor RunClient.test.ts and RunManager.test.ts

[seneyu]

Linked issue/ticket

N/A

Description

• Added test clean up for both RunClient.test.ts and RunManager.test.ts files
• Added test data object to testUtils.ts, reducing redundancy of listing example data in test files
• Minor refactor in mlflow-js.yaml so we can check the GitHub Actions result when making PR to dev

Reproduction steps

N/A

Checklist

• I've followed the Contributing guidelines
• I've titled my PR according to the Conventional Commits spec
• I've added tests that fail without this PR but pass with it
• I've linted, tested, and commented my code
• I've updated documentation (if appropriate)

[austinbfraser]

This looks great, thank you Stephany!