chore(Examples): Drop local eslint plugin

[t0maboro]

Description

No longer needed after #4201 . Reverting to the state before #3959 .

Changes

• removing all files and references to no longer used plugin

Before & after - visual documentation

N/A

Test plan

yarn lint is passing

Checklist

• Included code example that can be used to test this change.
• For visual changes, included screenshots / GIFs / recordings documenting the change.
• For API changes, updated relevant public types.
• Ensured that CI passes

[Copilot]

Pull request overview

Removes the now-unneeded local ESLint plugin from the example apps workspace, reverting the examples’ lint setup to the state before the custom require-top-level-exports rule was introduced.

Changes:

• Drops eslint-plugin-local-rules from apps/package.json and prunes it from apps/yarn.lock.
• Removes the tests-specific ESLint override config that enabled the local rule.
• Deletes the local ESLint plugin implementation from apps/eslint-plugin-local-rules/.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apps/yarn.lock	Removes the workspace link/locator entry for the deleted local ESLint plugin.
apps/src/tests/.eslintrc.js	Deletes the tests override that enabled the local-rules/require-top-level-exports rule.
apps/package.json	Removes the eslint-plugin-local-rules devDependency.
apps/eslint-plugin-local-rules/require-top-level-exports.js	Deletes the custom rule implementation.
apps/eslint-plugin-local-rules/package.json	Deletes the plugin’s package manifest.
apps/eslint-plugin-local-rules/index.js	Deletes the plugin entry point exporting the rule.

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