[IMP] core: increase timeout in watch mode & tell client

Currently, when enabling watch mode on a tour the tour's timeout does
not change. This is usually an issue because:

- watch mode makes tours a bit slower, so they can timeout even
  without doing anything
- trying to diagnose what's wrong, it's common to add check steps with
  a long timeout or even a `debugger` statement, which trips the
  python-side timeout and kills the tour

To avoid needing to remember to update the timeouts (then revert them
afterwards), just bump the timeout to 1h by default, or 10x the
original time for very long tours (e.g. qweb test suite, which
currently has a 30mn timeout).

While at it, forward the watch mode status to the client via the QS,
so we can eventually make use of it for one reason or an other.

closes odoo/odoo#96994

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

odoo/tests/common.py

@@ -1704,7 +1704,8 @@ class HttpCase(TransactionCase):
 
         self.start_browser()
         if watch and self.browser.dev_tools_frontend_url:
-            _logger.warning('watch mode is only suitable for local testing')
+            _logger.warning('watch mode is only suitable for local testing - increasing tour timeout to 3600')
+            timeout = max(timeout*10, 3600)
             debug_front_end = f'http://127.0.0.1:{self.browser.devtools_port}{self.browser.dev_tools_frontend_url}'
             self.browser._chrome_without_limit([self.browser.executable, debug_front_end])
             time.sleep(3)
@@ -1716,6 +1717,11 @@ class HttpCase(TransactionCase):
             self.cr.flush()
             self.cr.clear()
             url = werkzeug.urls.url_join(self.base_url(), url_path)
+            if watch:
+                parsed = werkzeug.urls.url_parse(url)
+                qs = parsed.decode_query()
+                qs['watch'] = '1'
+                url = parsed.replace(query=werkzeug.urls.url_encode(qs)).to_url()
             self._logger.info('Open "%s" in browser', url)
 
             if self.browser.screencasts_dir: