Add a reports page for overridden values

Problem/Motivation

We have discussed 🐛 There is no indication on configuration forms if there are overridden values Needs work in 📌 Drupal Usability Meeting 2023-09-08 Fixed . The link to the recording is https://youtu.be/LUzwPjS_YSA and for the record, the attendees at the usability meeting were @AaronMcHale, @Emma Horrell, @benjifisher, @rkoller, @simohell, and @worldlinemine.

This feature request here is one of two followups spun off 🐛 There is no indication on configuration forms if there are overridden values Needs work trying to improve the way overridden values are communicated on a config form. With the recommended changes in #2408549-182: There is no indication on configuration forms if there are overridden values → and #2408549-183: There is no indication on configuration forms if there are overridden values → all overridden values are still shown in an info message on top of the page on every page load. The cognitive load making the connection between the list of overridden values and the corresponding overridden fields can be challenging. In particular if it is a form with many fields and several to many overrides. One of the attendees had even a real life example of a site with +30 overrides on a single form. And overrides could be scattered over several different configuration forms across the site. To stay on top of complex sites with several overrides as well as coming new into a site as a new site builder, developer or consultant could be quite challenging. Aside the proposed change in the other follow up ( ✨ Indicate that a field value is overridden inline Active ) the group is in line with the suggestion initially brought up in the original issue ( #44 🐛 There is no indication on configuration forms if there are overridden values Needs work and #46 🐛 There is no indication on configuration forms if there are overridden values Needs work ) - to add a reports page for overridden values. That would provide a top level overview of all overridden values across the site.

Steps to reproduce

Proposed resolution

• Create a reports page

(*We haven't had any time left during the meeting to discuss any details about what kind of informations to provide on the reports page yet)

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet