feat(tests): Replaced toBeFalsy and toBeTruthy in getters_spec.js

What does this MR do and why?

• This MR replaces toBeFalsy and toBeTruthy
• This MR fixes #369733 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. yarn
2. yarn jest ee/spec/frontend/geo_node_form/store/getters_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.