#57639: Remove admin email address from password and email change notification emails

[masteradhoc]

When a user's password or email address is changed, WordPress sends them a notification email. Both of these emails currently include the site's Administration Email Address via the ###ADMIN_EMAIL### placeholder, with the message:

"If you did not change your password, please contact the Site Administrator at [admin@example.com]"

This exposes the Administration Email Address to any user who triggers these notifications — subscribers, WooCommerce customers, newsletter subscribers, etc. The address is often a personal email belonging to the site owner, and was never intended to be public-facing. It can also belong to a technical administrator or agency who is not the right contact for end-user support.

The ###SITENAME### and ###SITEURL### placeholders are already present in both email templates, giving users sufficient context to find the site and reach out through the appropriate channel.

Trac ticket: https://core.trac.wordpress.org/ticket/57639

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