chore: eslint update (M2-7725)

[ChaconC]

Merged dev into #531, opening PR to test amplify environment

Original Description:

📝 Description

🔗 Jira Ticket M2-7725

Changes include:

• Upgrade deps (Eslint, prettier, etc.)
• Migrate eslint config from the old version to a new one (eslint flat style)
• Resolve all eslint errors and warnings
• Upgrade axios
• Some packages that have ability to upgrade the minor version

Test process:

• yarn test
• yarn build
• Run the project and execute the minimal flow (Login, Open applet, Open Activity, Pass the Activity, Submit Answers)

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[felipeMetaLab]

Looks good to me.

[farmerpaul]

@ChaconC just a heads-up that the version of node we have defined in .nvmrc (v20.5.1) is apparently no longer compatible with this new version of ESLint:

I assume our CI ignores .nvmrc, so this didn't get caught automatically, and maybe other engineers' environments aren't configured to auto-select the node version based on .nvmrc. Curious what you use for node version management?