Feature Request: Add share buttons on Jetpack Search results

### Impacted plugin

Jetpack, Search

### What

A user suggested combining Jetpack Search with social sharing by allowing users to share search results.

### How

Maybe allowing Jetpack Share buttons to be added to the search results modal, enabling users to share individual results directly from the interface could be an option.

This was reported here: 9215952-zd-a8c

No files or tests are named. Start by locating the Jetpack Search results modal and reviewing Jetpack Share's existing button behavior. Clarify whether sharing applies to individual results and which interface states are required; done should mean an agreed scope, implemented buttons, and coverage for the result-sharing behavior.

Written by the indexing model from the issue text.