Replaced usages of toBeTruthy/toBeFalsy

What does this MR do and why?

Replaced the usages of of toBeTruthy/toBeFalsy in ee/spec/frontend/vulnerabilities/history_comment_spec.js

Resolves the issue

Screenshots or screen recordings

How to set up and validate locally

1. Navigate inside gitlab directory
2. Run yarn jest ee/spec/frontend/vulnerabilities/history_comment_spec.js

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

Related to #369787 (closed)