Add ability for a single Feedback Button to be reused across multiple pages on a site

The Feedback Button cannot be added to a reusable block or otherwise reused (by selecting the same survey for different instances of the block) across multiple pages on a site.

Start by locating the Feedback Button block and tracing how a selected survey is stored when the block is used in a reusable block across multiple pages. Determine the expected behavior for multiple instances, then verify that one button can reuse the same survey without conflicts on each page.

Written by the indexing model from the issue text.