When inside an HttpCase, the end of a successful request will
`signal_changes` meaning that the registry_invalidated flag is removed.
A second issue is that this flag is thread local meaning that if a
request set the flag, it won't be visible from the test thread.
For those reasons, this commit ensures the registry sequences are
incremented as in production mode, and adds a check that the sequence
didn't change during the tests, calling `setup_models` the registry
manually if needed.
closesodoo/odoo#121268
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>