PLT-3132 Add a direct message link to the contact pop-over (#4853)

* added DM button to the user picture and name popover

* removed isRequired from status and busy properties from profile_popover.jsx

webapp/sass/components/_popover.scss

@@ -34,6 +34,32 @@
             }
         }
     }
+
+    .popover-dm__content {
+        -webkit-border-radius: 0;
+        -moz-border-radius: 0;
+        -ms-border-radius: 0;
+        -o-border-radius: 0;
+        border-radius: 0;
+        max-width: 100%;
+        overflow: hidden;
+        padding: 5px 5px 5px 0px;
+        text-overflow: ellipsis;
+        margin: 0;
+        font-size: 14px;
+        border-top: 1px solid #ebebeb;
+        border-color: rgba(221, 221, 221, 0.2);
+        margin-top: 5px;
+        margin-bottom: -5px;
+        > a {
+            > i {
+                margin-right: 5px;
+            }
+            > span {
+                text-transform: capitalize;
+            }
+        }
+    }
 }
 
 .channel-header__info {