Show view tags on administrative list of views

Problem/Motivation

#2574767-36: Views listing page displays too few items on a page → removed the "Tags" column from the list of views at /admin/structure/views, because it was rarely used.

I don't personally use Views Tags on every project, so I understand with, and largely agree with the reasoning in that issue. Also I couldn't find any other issues asking for it to be re-added, which probably also indicates that the feature is not used that often.

That being said, I do find Views tags very useful in specific situations, e.g.: for managing technical debt on a site with multiple developers and a tight timeline... I tag views by their base table, contextual filters, whether they use aggregation, and where they are used; so that it is easy for developers to find an existing view they can add a new display to (rather than creating an entirely new view), and it is easy to see which views could be combined when they are already a mess.

Ideally, the list of views at /admin/structure/views would become a view of its own (e.g.: as part of #1823450: [Meta] Convert core listings to Views → ), which would allow me to simply add a tags column on the sites that required it; and leave it at the default everywhere else.

However, in the meantime, it would be handy to have a patch to apply to add the tags column back.

Proposed resolution

Write a patch to re-add the tags column.

Remaining tasks

I'll leave it to others to determine whether this is something we want to add back to Drupal core; or just leave here for people to apply when they need it.

User interface changes

Adds a "tags" column between Description and Displays to the list of views at /admin/structure/views

API changes

None.

Data model changes

None.