Do not automatically credit people who upload files to an issue

Problem/Motivation

When somebody uploads a file to an issue queue (a patch, a screenshot, etc.), their user is automatically ticked in the list of people to be credited in the "Credit & committing" section. When the issue is closed as "Fixed", they receive a credit unless the project owner or another project maintainer removes the tick . If the upload is a patch, it also look to me like the tick cannot be disabled. even if the patch is pure garbage.

It looks like some people may use this as a way earn undeserved issue credits. See related issue for what I suspect is an example of this.

Proposed resolution

Remove the misfeature that automatically credit people who upload files to an issue from Drupal.org customizations.