Add truncation to work item description

What does this MR do and why?

Adds truncation to work item description when description exceeds a max height.

MR acceptance checklist

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Short	Long	Long, small width

How to set up and validate locally

1. Enable :work_items_mvc_2
2. Create a task with a long description
3. Reload the task

Related to #441326 (closed)

spec/frontend/work_items/components/work_item_description_rendered_spec.js

@@ -22,6 +22,7 @@ describe('WorkItemDescription', () => {
     canEdit = false,
     disableInlineEditing = false,
     mockComputed = {},
+    hasWorkItemsMvc2 = false,
   } = {}) => {
     wrapper = shallowMount(WorkItemDescriptionRendered, {
       propsData: {
@@ -30,6 +31,9 @@ describe('WorkItemDescription', () => {
         disableInlineEditing,
       },
       computed: mockComputed,
+      provide: {
+        workItemsMvc2: hasWorkItemsMvc2,
+      },
     });
   };
 
@@ -53,6 +57,7 @@ describe('WorkItemDescription', () => {
             return true;
           },
         },
+        hasWorkItemsMvc2: true,
       });
 
       expect(wrapper.find('.description-more').exists()).toBe(true);
@@ -71,6 +76,7 @@ describe('WorkItemDescription', () => {
             return false;
           },
         },
+        hasWorkItemsMvc2: true,
       });
 
       expect(wrapper.find('.description-more').exists()).toBe(false);