Adding migration to rename 'housing'... to 'housing-local-services'...

Renaming the tag 'housing' to 'housing-local-services' so 'housing' can be reused as a topic.

There is a Whitehall PR for retagging detailed guides (https://github.com/alphagov/whitehall/pull/1796) and a Router-data PR (https://github.gds/gds/router-data/pull/198) for redirecting the browse categories.
Hmm - I can't see where that validation is being enforced in [the govuk_content_models `Artefact` class](https://github.com/alphagov/govuk_content_models/blob/51be4e8459231fe70849cef6f2a33757f3ced2e2/app/models/artefact.rb). I wonder if it's called on trying to archive downstream editions as part of the `after_save` callback, and it's the editions that are raising the error?