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.
Do we want to update archived artefacts too? If we don't, we probably won't be able to update them easily again in the future, as they'll raise an exception on missing tags when we call `save` on them.