Init Sourcegraph on the blob refactor

Ensures Sourcegraph is loaded on the blob refactor

app/assets/javascripts/vue_shared/components/source_viewer.vue

@@ -2,6 +2,7 @@
 import { GlSafeHtmlDirective } from '@gitlab/ui';
 import LineNumbers from '~/vue_shared/components/line_numbers.vue';
 import { sanitize } from '~/lib/dompurify';
+import '~/sourcegraph/load';
 
 const LINE_SELECT_CLASS_NAME = 'hll';