chore: update ESLint, migrate configuration file (#2574)

### 🎯 Goal

Time to UPGRADE and migrate. :)

PR is divided into multiple commits, ESLint changes, Prettier changes
and manual changes - we can drop Prettier changes for `master` merges
(so that I don't have to deal with merge conflicts) and merge this PR
once our PR backlog is somewhat empty.

#### Notable Changes

- changed CI to run on Node@lts/* instead of v16 and v18
- adjusted `bundle-cjs.mjs` and `getPackageVersion.mjs` to use import
for `package.json` instead (`with` assertion)
- reduced Prettier print-width to 90 (from 100, default is 80) as some
new formattings are just weird
- omitted `eslint-plugin-prettier` as Prettier format step is included
in CI anyway
- explicitly installed `@testing-library/dom` as it's required by our
tests and is no longer installed with `eslint-plugin-jest-dom`
- `noUnusedParameters` and `noUnusedLocals` (`tsconfig.json`) are now
set to `false` to not fail build steps, developers are still warned
through ESLint
- omitted certain other plugins since those weren't used apparently,
compare against these old configs - [generated against
Attachment.test.js](https://gist.github.com/arnautov-anton/9bdce867ed1ddf2b82a6f3f7a5bd9e04)
and [against
Attachment.tsx](https://gist.github.com/arnautov-anton/ee8dbdb8fda4906a0c436c21686e2105)

Author: arnautov-anton

.eslintignore

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [16, 18]
+        node: [lts/*]
     name: Test with Node ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v3

.eslintrc.json

@@ -1,7 +1,7 @@
 {
   "arrowParens": "always",
   "jsxSingleQuote": true,
-  "printWidth": 100,
+  "printWidth": 90,
   "singleQuote": true,
   "tabWidth": 2,
   "trailingComma": "all"

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-/* eslint-disable sort-keys */
+ 
 const smallImageAttachment = [
   {
     type: 'image',