Replace "Details" button with KCollapsibleGroupBox

Summary:
Remove "Details" button and use KCollapsibleGroupBox to display more details.

{F6920180}

{F6920182}

{F6920185}

Reviewers: #vdg, ngraham, GB_2

Subscribers: kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D21953