Updates frontend server, adds Tests

[benhammondmusic]

Description and Motivation

• closes Need tests for frontend_server #3152
• refactors from commonjs requires() to esmodule import() style
• re-enables dependabot on frontend server deps
• enables super linter on frontend_server
• refactors to use built in node fetch
• pins node version (required due to built in fetch)

Has this been tested? How?

• new tests fails when intentionally breaking the code

Screenshots (if appropriate)

Types of changes

(leave all that apply)

• Refactor / chore

New frontend preview link is below in the Netlify comment 😎

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