Remove Bootstrap Carousel

The Bootstrap carousel module is used for image carousels, and we don't
use it anywhere on the site. Also separated the Bootstrap JavaScript into separate components and removed the carousel component.

Fixes #14670.

app/assets/javascripts/application.js.coffee

@@ -22,7 +22,17 @@
 #= require cal-heatmap
 #= require turbolinks
 #= require autosave
-#= require bootstrap
+#= require bootstrap/affix
+#= require bootstrap/alert
+#= require bootstrap/button
+#= require bootstrap/collapse
+#= require bootstrap/dropdown
+#= require bootstrap/modal
+#= require bootstrap/scrollspy
+#= require bootstrap/tab
+#= require bootstrap/transition
+#= require bootstrap/tooltip
+#= require bootstrap/popover
 #= require select2
 #= require raphael
 #= require g.raphael

app/assets/stylesheets/framework/tw_bootstrap.scss

@@ -43,7 +43,6 @@
 @import "bootstrap/modals";
 @import "bootstrap/tooltip";
 @import "bootstrap/popovers";
-@import "bootstrap/carousel";
 
 // Utility classes
 .clearfix {