Add Note Regarding View Config and Emails

[pykettk]

Description

Adds a note regarding how etc/view.xml configurations are applied to emails during area emulation.

Affected page: https://developer.adobe.com/commerce/frontend-core/guide/themes/configure/

Motivation and Context

This information does not appear to be documented anywhere and developers will waste time trying to figure out why their theme configuration is not being applied in some scenarios - see magento/magento2 issue#36340.

How Has This Been Tested?

1. Put product out of stock
2. Run relevant indexers
3. Register for a stock alert for the product from step 1
4. Run the product_alert queue consumer
5. Observe that only etc/view.xml configurations defined in modules are loaded in Magento\Framework\Config\View::read()

Types of changes

• Documentation update

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[jeff-matthews]

Thanks for the contribution and sorry about the delay on this @pykettk. I'm verifying your changes now.

[keharper]

@jeff-matthews Did you find someone to verify this PR?

[jeff-matthews]

Yes, but I never heard back. I'll have to find someone else after the June release.

[dobooth]

Closing as abandoned. Please reopen when ready.

[dobooth]

Closed by error.