Make Alert Menu Bar scrollable

[mcverter]

The top Alert Menu Bar (#wp-admin-bar-buoy)

should have a scrollbar in case there are a lot of alerts coming in.
You simply can not see past a certain bottom limit (maybe 40?) and there is no way to continue downwards.

Not sure what the priority of this is.

[fabacab]

I can scroll this view on my device…? What device(s) are you using?

As a relevant aside, we have an issue template that we request bug reporters use when writing up bug reports. That template provides bug reporters with a checklist to make sure important information about bug reports, such as what device you're using in which the bug is happening, gets reported as part of the initial bug report. This saves everyone time and reduces confusion.

That issue template is automatically inserted as the content of a new issue when reporters click the "New issue" button. This means that bug reports without this template indicate the reporter manually deleted the template. Please don't do that.