ESLint improvements (#388)

## Description

Adds various features to improve the DX with eslint:

### Webpack

- Use `eslint-webpack-plugin` for better observability of lint errors
during development.

### Ignored files

- Enable `.gitignore` support for eslint.

### Commit hook

- Add `eslint --fix` to pre-commit hook.

### Github actions
- Add eslint check to a new github action workflow.
- Use `eslint-formatter-gha` to annotate PR files with lint failures
(see the Files changed tab,
[example](https://github.com/openfrontio/OpenFrontIO/pull/388/commits/73862230be5aad7b18e122b1cd4ab05fc9570b2c)).


![image](https://github.com/user-attachments/assets/b399b92e-8eb0-48e1-92b7-ce630ccf12e1)

## Testing

These changes have been validated through local testing and through
Github workflows.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

fake.neo

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

.github/workflows/eslint.yml

@@ -0,0 +1,18 @@
+name: ESLint Check
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  eslint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+      - run: npm ci
+      - run: npx eslint --format gha