consolidate all behavior imports into an index.js file

app/assets/javascripts/behaviors/index.js

+import './autosize';
+import './bind_in_out';
+import './details_behavior';
+import { installGlEmojiElement } from './gl_emoji';
+import './quick_submit';
+import './requires_input';
+import './toggler_behavior';
+
+installGlEmojiElement();

app/assets/javascripts/main.js

@@ -37,14 +37,7 @@ import './shortcuts_issuable';
 import './shortcuts_network';
 
 // behaviors
-import './behaviors/autosize';
-import './behaviors/details_behavior';
-import './behaviors/quick_submit';
-import './behaviors/requires_input';
-import './behaviors/toggler_behavior';
-import './behaviors/bind_in_out';
-import { installGlEmojiElement } from './behaviors/gl_emoji';
-installGlEmojiElement();
+import './behaviors/';
 
 // blob
 import './blob/create_branch_dropdown';