refactor: remove lodash altogether

[wojtekmaj]

What:

Continues effort from #593; further improves on #592

Why:

Reduces @testing-library/jest-dom's install footprint by 1.35 MB

How:

Replaces remaining lodash method with custom function

Checklist:

• [ ] Documentation
• [x] Tests
• [ ] Updated Type Definitions
• [x] Ready to be merged

[wojtekmaj]

Eh. only now I saw the discussion about maintainer's second thoughts.