Tighten TypeScript linting

[imnasnainaec]

Closes #1217

Applies "plugin:@typescript-eslint/recommended" (except for "@typescript-eslint/no-explicit-any": "off", and a few specific exceptions to other rules).
Also, changes some of our "off"s to "warn"s (with "react/display-name": "off", removed because it is "warn" by default with our "extends": content).
Also, changes "unused-imports/no-unused-imports" from "error" to "warn" for developer convenience.

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This change is 

[jasonleenaylor]

Reviewed 28 of 29 files at r1, all commit messages.
Reviewable status: 28 of 29 files reviewed, all discussions resolved (waiting on @imnasnainaec)

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src/components/AppBar/UserMenu.tsx line 116 at r1 (raw file):

// <Menu> automatically applies a ref to its first child for anchoring. The
// following prevents a console warning: "Function components cannot be given refs.
// Attempts to access this ref will fail. Did you mean to use React.forwardRef()?"

This comment looks outdated.

Code quote:

// <Menu> automatically applies a ref to its first child for anchoring. The
// following prevents a console warning: "Function components cannot be given refs.
// Attempts to access this ref will fail. Did you mean to use React.forwardRef()?"

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src/components/Login/LoginPage/tests/LoginComponent.test.tsx line 15 at r1 (raw file):

  "@matt-block/react-recaptcha-v2",
  () =>
    function MockRecaptcha() {

What do we make happy by naming this function?

[imnasnainaec]

Reviewable status: 27 of 29 files reviewed, all discussions resolved (waiting on @imnasnainaec and @jasonleenaylor)

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src/components/AppBar/UserMenu.tsx line 116 at r1 (raw file):

Previously, jasonleenaylor (Jason Naylor) wrote…

This comment looks outdated.

Affirmed and retired.

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src/components/Login/LoginPage/tests/LoginComponent.test.tsx line 15 at r1 (raw file):

Previously, jasonleenaylor (Jason Naylor) wrote…

What do we make happy by naming this function?

https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/display-name.md

[jasonleenaylor]

Reviewed 5 of 5 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)