Option to not notify search engines on post update

[sybrew]

When a user updates a post, the post updated time changes. TSF reads this and puts it in various places: structured data, Open Graph metadata, and the sitemap.

Google takes this data and can show it in the search engine result pages. This may be an unwanted side effect.

We could allow users to freeze the updated time to prevent that from changing (or, sometimes, even showing up). Subsequently, when that is requested, we shouldn't ping search engines about changes on the site.

Still, search engines can use other indicators to determine the date shown. But freezing the time helps a lot.
https://developers.google.com/search/blog/2019/03/help-google-search-know-best-date-for