Merge branch 'remove-require-context-graphs-bundle' into 'master'

Remove require.context from graphs_bundle

See merge request !9459

app/assets/javascripts/graphs/graphs_bundle.js

-// require everything else in this directory
-function requireAll(context) { return context.keys().map(context); }
-requireAll(require.context('.', false, /^\.\/(?!graphs_bundle).*\.(js|es6)$/));
+require('./stat_graph_contributors_graph');
+require('./stat_graph_contributors_util');
+require('./stat_graph_contributors');
+require('./stat_graph');