Include feature flags in segment status

[bcb37]

• Adds feature flag public segment use data to the segments page
• Changes the UI of the 'Used' modal on the segments details page to include feature flag information

[zackcl]

I just have a style suggestion. Updating the column widths of the 'Type', 'Status', and 'Used List' columns to 20% looks better to me.

         .cdk-column-type {
-          flex: 0 0 15%;
+          flex: 0 0 20%;
           justify-content: left;
         }
         .cdk-column-experimentState {
-          flex: 0 0 30%;
+          flex: 0 0 20%;
           justify-content: left;
         }
         .cdk-column-usedList {
-          flex: 0 0 15%;
+          flex: 0 0 20%;
           justify-content: left;
         }

Here's the screenshot after the change:

Also, please apply this change to prevent the circle from being distorted when the status is 'Enrollment Complete':

            &-circle {
               display: inline-block;
               margin-right: 6px;
               border-radius: 50%;
-              width: 12px;
-              height: 12px;
+              min-width: 12px;
+              min-height: 12px;
             }

Before the change:

After the change: