Upgrade Jest to v30

[mao-sz]

Because

Major version bump - not vital due to small repo scope but v29 no longer actively maintained and no other changes needed in the codebase, so might as well.

This PR

• Upgrades Jest to v30.X
• Removes jest-cli as a top-level dep (it's just an internal package for Jest itself)
• Fix path ignore pattern to ignore archive dir (not really that necessary but might as well prevent archive tests ever running somehow)

Issue

Closes #XXXXX

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. 01_helloWorld: Update test cases
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If this PR includes any changes that affect the solution of an exercise, I've also updated the solution in the /solutions folder