Track when a notification related to a block pops up in VisualEditor.
Metrics should be added to the following bucket 'MediaWiki.BlockNotices.' . wgWikiID . '.VisualEditor.shown' and should be enabled/disabled using a config Flag[1].
wgWikiID may or may not be available if https://gerrit.wikimedia.org/r/c/mediawiki/core/+/472375 gets merged
Similar tracking is pending review on MobileFrontend. Implementing this is pretty much the same as in here
[1] https://gerrit.wikimedia.org/r/c/mediawiki/extensions/VisualEditor/+/472342/2/extension.json#102