Replace BSTooltip with GlTooltip

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/249794

Replace: $el.tooltip('_fixTitle') -> fixTitle($el)

app/assets/javascripts/blob/viewer/index.js

@@ -5,6 +5,7 @@ import { handleLocationHash } from '../../lib/utils/common_utils';
 import axios from '../../lib/utils/axios_utils';
 import eventHub from '../../notes/event_hub';
 import { __ } from '~/locale';
+import { fixTitle } from '~/tooltips';
 
 const loadRichBlobViewer = type => {
   switch (type) {
@@ -124,7 +125,7 @@ export default class BlobViewer {
       this.copySourceBtn.classList.add('disabled');
     }
 
-    $(this.copySourceBtn).tooltip('_fixTitle');
+    fixTitle($(this.copySourceBtn));
   }
 
   switchToViewer(name) {