Enable import sorting ESLint rules for plugin-rsc directory

[Copilot]

Previously, the entire packages/plugin-rsc/** directory was completely ignored by ESLint. This PR enables only import sorting related rules for the plugin-rsc directory while keeping other ESLint rules disabled.

Changes Made

1. Removed global ignore: Removed packages/plugin-rsc/** from the global ignores array in eslint.config.js

2. Added targeted configuration: Added a new ESLint configuration section specifically for packages/plugin-rsc/** files that:

   • Disables all existing ESLint rules (TypeScript, Node.js, regexp, etc.)
   • Enables only the three import sorting related rules:
     • import-x/no-duplicates: Prevents duplicate imports
     • import-x/order: Enforces import order (built-ins, externals, internals)
     • sort-imports: Sorts import members alphabetically

3. Applied auto-fixes: Ran ESLint auto-fix to resolve 27 import sorting violations across the plugin-rsc codebase

Example of fixes applied

Before:

import { test, expect } from '@playwright/test'
import { setupInlineFixture, useFixture } from './fixture'
import { x } from 'tinyexec'

After:

import { expect, test } from '@playwright/test'
import { x } from 'tinyexec'
import { setupInlineFixture, useFixture } from './fixture'

This ensures consistent import organization in the plugin-rsc codebase while avoiding the overhead of running all ESLint rules on this experimental package.

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