Modify components empty state

[octaedro]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

This PR creates an EmptyState component for multiple uses. This abstraction was meant to be used under the Variations, Attributes, and Custom Fields sections.

Closes #47293.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Make sure the New product editor is enabled under /wp-admin/admin.php?page=wc-settings&tab=advanced&section=features.
2. Go to Products > Organization.
3. The Attributes section should show the empty state

4. Press the Show custom fields toggle.
5. The empty state for the Custom fields should be visible.

6. Go to the Variations tab.
7. The empty state for the Variations should be visible as well.

Changelog entry

• Automatically create a changelog entry from the details below.

Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

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Comment

[github-actions]

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[octaedro]

To make this more defensive, when the name is an empty string we use a grey block.

[github-actions]

Hi @louwie17, @woocommerce/mothra

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[louwie17]

Tested well and code looks good, nice work @octaedro