[FIX] tests: log remaining requests as info

When an HttpCase browser_js test is unable to join a request thread, a
warning is logged.

To avoid mergebot failures, this commit changes the warning to a log
info.

This problem was introduced by the refactor in this commit: 3ca788f55

closes odoo/odoo#36022

Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

odoo/tests/common.py

@@ -955,7 +955,7 @@ class HttpCase(TransactionCase):
 
         request_threads = get_http_request_threads()
         for thread in request_threads:
-            self._logger.warning("Stop waiting for thread %s handling request for url %s",
+            self._logger.info("Stop waiting for thread %s handling request for url %s",
                                     thread.name, getattr(thread, 'url', '<UNKNOWN>'))
 
         if request_threads: