[FIX] core: deploy command broken in multi-db

Start a server without a -d and with a --dbfilter that allows for
multiple database. Make sure one of the database has the
`base_import_module` addon installed. Create an empty module using
scaffold and deploy it to the server, make sure to provide the `--db`
argument to the deploy command.

It zips the file and attempt to upload it but it fails for a 404 page
not found error.

The problem is that the controllers of base_import_module are only
accessible when the client is connected to a database. It must first
connect to a database (to have a db in his session) and then access the
controller.

The /web/login route is an example of a rather cheap route to get that
is both accessible without being connected to a database and that takes
a `?db=` argument to connect to one. Using that route, we can ensure
that we are connected to a database prior to uploading a module.

Closes #104589

closes odoo/odoo#107906

X-original-commit: 8feb5f366255c8cb7927842acea3ec76bbe11df2
Signed-off-by: Julien Castiaux <juc@odoo.com>

odoo/cli/deploy.py

@@ -26,6 +26,7 @@ class Deploy(Command):
 
     def login_upload_module(self, module_file, url, login, password, db, force=False):
         print("Uploading module file...")
+        self.session.get(f'{url}/web/login?db={db}', allow_redirects=False)  # this set the db in the session
         endpoint = url + '/base_import_module/login_upload'
         post_data = {
             'login': login,