Feature: #75691 - Upgrade Analysis - Provide listing of documentation files

See Issue #75691

Description

The install tool now shows all the documentation files that were delivered with the core in the section Upgrade analysis . All files can be read inline, but there is no parsing, plain .rst is shown to the user.

Impact

The install tool features a new main entry point that lists the documentation files shipped with the core. Filtering by tags provided in the documentation files helps to find interesting changes.