Add second line of text for KickerDash item descriptions

Summary:
Adds a second line of text under icon/doc icons for more clarity.
Will stop at two lines; if text continues, it will be elided.

BUG: 362986

Test Plan:

• Install Application Dashboard, identify a one-line elided item
• Apply patch and compile
• Check that item text is now two lines but does not overlap next row

Reviewers: ngraham, hein, Plasma

Reviewed By: ngraham

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D13122