Added new Detailed Description field to Group edit/details screen

[h-kataria]

https://bugzilla.redhat.com/show_bug.cgi?id=1784243

before

after

[miq-bot]

Checked commit h-kataria@d2edf1f with ruby 2.5.7, rubocop 0.69.0, haml-lint 0.20.0, and yamllint
2 files checked, 1 offense detected

**

• 💣 💥 🔥 🚒 - Linter/Haml - Linter::Haml STDERR:

warning: parser/current is loading parser/ruby25, which recognizes
warning: 2.5.5-compliant syntax, but you are running 2.5.7.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.