Update the triggers for the functions that maintain the external wiki
flag on the project table so that they check the new column values for
the STI `type/type_new`.

The migration ensures that there is no point at which one of the
triggers is not installed, ensuring we do not allow rows to be inserted,
updated or deleted without triggering one or other of the two versions
of the trigger.

A new temporary trigger is added, which handles the fact that we first
insert rows with `type` set, and then later set `type_new` as part of
the STI migration for the `integrations` table.

Changelog: changed

Fix project spec

This uses a factory to ensure that the type/type_new columns are set
correctly, and renames 'service' to 'integration' where appropriate.

https://gitlab.com/gitlab-org/gitlab/-/issues/334127