Populate selected item in filtered search input

app/assets/javascripts/filtered_search/dropdown_assignee.js.es6

@@ -12,7 +12,8 @@
       const dataValueSet = this.setDataValueIfSelected(e.detail.selected);
 
       if (!dataValueSet) {
-        console.log('set value');
+        const username = e.detail.selected.querySelector('.dropdown-light-content').innerText.trim();
+        gl.FilteredSearchManager.addWordToInput(this.getSelectedText(username));
       }
 
       this.dismissDropdown();

app/assets/javascripts/filtered_search/dropdown_author.js.es6

@@ -9,7 +9,10 @@
     }
 
     itemClicked(e) {
-      console.log('author clicked');
+      const username = e.detail.selected.querySelector('.dropdown-light-content').innerText.trim();
+      gl.FilteredSearchManager.addWordToInput(this.getSelectedText(username));
+
+      this.dismissDropdown();
     }
 
     renderContent() {

app/assets/javascripts/filtered_search/dropdown_milestone.js.es6

@@ -12,7 +12,8 @@
       const dataValueSet = this.setDataValueIfSelected(e.detail.selected);
 
       if (!dataValueSet) {
-        console.log('set value');
+        const milestoneName = `%${e.detail.selected.querySelector('.btn-link').innerText.trim()}`;
+        gl.FilteredSearchManager.addWordToInput(this.getSelectedText(milestoneName));
       }
 
       this.dismissDropdown();