feat(tests): Replaced toBeTruthy with toBe(true) in common_utils_spec.js

What does this MR do and why?

• This MR replaces toBeTruthy with toBe(true)
• This MR fixes #369644 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. yarn
2. yarn jest spec/frontend/lib/utils/common_utils_spec.js

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.