Organizations List - Use HTML and GlTruncateText for Descriptions

What / Why

Follow up for @peterhegman thread: !132418 (comment 1583008188)

WDYT about doing something similar to the groups_list_item.vue component? See https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/assets/javascripts/vue_shared/components/groups_list/groups_list_item.vue#L151

We may also want to change the description field to descriptionHtml as that is the convention we use when getting a markdown field.

Finally the GlTruncateText component works well to truncate long descriptions which we will probably want to do in this case as well.

Proposal

Update organizations_list_item.vue to use descriptionHtml and GlTrucnateText to better present Organization data. We can model this almost 1 to 1 from the existing group_list_item.vue component