Upgrade to React 18

[carolynzhang18]

Notion ticket link

Update React version

Implementation description

• Bumped React up to v18.x.x in frontend/
• Bumped Node up to v20.11.1 (latest stable version right now) everywhere
• The rest of the changes are just fixes based on linting with the upgraded linter

Steps to test

1. Go to the frontend directory - cd frontend
2. Delete node_modules - rm -r node_modules - if you have them (if not, ignore this step).
3. Run yarn install.
4. Run yarn start.
   Expected: everything should compile and localhost should be up:
   
   

What should reviewers focus on?

• The frontend compiles... but not sure how well it plays w/ backend and querying...
• One change I'm slightly iffy about: I had to comment out the // import { decamelizeKeys } from "humps"; in CreateForm.tsx and UpdateForm.tsx to dodge some linter warnings about unused vars. This seems probably fine - scroll down a bit in either file and there are other examples of whole blocks of commented out code marked with // python {

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[github-actions]

Visit the preview URL for this PR (updated for commit badf90f):

https://uw-blueprint-starter-code--pr187-carolyn-upgrade-reac-f3vby7y1.web.app

_{(expires Mon, 15 Apr 2024 01:11:54 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 8a9d9b9ea27110b294ec3954ff89dab270e34c45}

[achandrabalan]

[achandrabalan]

You rn ^

[owen-sellner]

Everything works as expected, great job!!!