Since #77735 the chrome runner uses a receiver thread to better handle the
full-duplex nature of Chrome's websocket communication.
However that thread was missing the `dbname` threadlocal, leading to some of
the logging and reporting to be mis-configured, and thus the filtering on CI
(runbot) to exlude any logging message emitted from the receiver thread, such
as the screenshot notifications.
Fix by passing the current `dbname` to the receiver thread when spawning it,
and having said receiver start by setting up the threadlocal.
closesodoo/odoo#79808
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>