[FIX] tests: make sure screencasts dir exists before writing to it

Without this patch, running this command on an environment where the tour will fail, will create massive and useless logs:

    odoo --stop-after-init -i auth_totp --test-enable --test-tags /auth_totp

This is because this method is a callback that can come in a different thread, creating a race condition.

There's no problem on checking wether the directory exists before creating the file, and then safeguarding from the problem.

@moduon MT-1075

closes odoo/odoo#151579

X-original-commit: 7aca8ae8728c66700c3afdca350e99ea78a63d88
Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>

odoo/tests/common.py

@@ -1343,12 +1343,15 @@ which leads to stray network requests and inconsistencies."""
     def _handle_screencast_frame(self, sessionId, data, metadata):
         self._websocket_send('Page.screencastFrameAck', params={'sessionId': sessionId})
         outfile = os.path.join(self.screencasts_frames_dir, 'frame_%05d.b64' % len(self.screencast_frames))
-        with open(outfile, 'w') as f:
-            f.write(data)
-            self.screencast_frames.append({
-                'file_path': outfile,
-                'timestamp': metadata.get('timestamp')
-            })
+        try:
+            with open(outfile, 'w') as f:
+                f.write(data)
+                self.screencast_frames.append({
+                    'file_path': outfile,
+                    'timestamp': metadata.get('timestamp')
+                })
+        except FileNotFoundError:
+            self._logger.debug('Useless screencast frame skipped: %s', outfile)
 
     _TO_LEVEL = {
         'debug': logging.DEBUG,