Revert "chore: update eslint config and quiet lint output"

[mrubens]

I'm nervous about the lint rules confusing the agent, so reverting for now. Let's discuss more!

---

Important

Reverts ESLint configuration and lint script changes to previous state due to concerns about agent confusion.

• Revert Changes:
  • Reverts ESLint configuration in .eslintrc.json to previous state, removing extended rules and plugins.
  • Reverts lint script in package.json and webview-ui/package.json to remove --quiet flag.

^{This description was created by for 810bbb4. It will automatically update as commits are pushed.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 810bbb4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[ellipsis-dev]

The ecmaVersion is set to 6, which is outdated. It should be updated to a more recent version, like 2021, to support modern JavaScript features. This is in line with our Development Standards: https://www.notion.so/Development-Standards-59febcf8ead647fd9c2ec3f60c22f3df?pvs=4#11869ad2d58180f3b596d34d01891cb5