Add a supporting code to separate groups#show
and groups#details which is required for the
proper implementation of the Group Overview
content and Security Dashboard option for it

Add CHANGELOG entry

Changed it from being json links to normal links & then doing a AJAX request to get the content.

Closes #29624

expand remaining non-explicit eslint-disable blocks and factor out globals when no-undef encountered

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>