fixes #23232 - fix error when domain not in taxonomy

This ensures that if domain_id is set, but domain not found (for example
when domain is in another taxonomy), the shortname still removes the
domain from the host's FQDN.

Fixes #22779 - Calculate out of sync host via origin interval (#5221)

Refs #22164 - use cheaper FactoryBot methods

• Refs #22164 - FactoryBot.build -> FactoryBot.build_stubbed

• Refs #22164 - FactoryBot.create -> FactoryBot.build

in
- test/unit/*
- test/models/shared/taxonomies_base_test.rb
- test/controllers/hosts_controller_test.rb

Fixes #21776 - Improved fact importing to deal with names

Now the list of fact names will be calculated beforehand and saved
to the database. It will also consider that the name could be added
from other thread.

Fixes #21424 - use factory_bot_rails

fixes #18102 - a host cannot be backed by the same vm

fixes #16557 - move tests into modern Rails layout

Models, controllers, mailers and helpers are now in test/ subdirs
matching app/ subdirs. Service, miscellaneous and old test/lib/ tests
are now in test/unit/ separated from models, which obsoletes the custom...