Add a "log failure to SharePoint" branch

Theo's renewal flow occasionally fails on Get manager (V2) due to permission issues. By default, a failed action kills the whole run. That's the wrong behaviour for Drumlin: one failed email shouldn't stop the rest of the renewals from being processed.

Add a parallel branch after Get manager (V2) that runs after Failed or TimedOut, and logs the failure to a SharePoint list called Renewal Errors. The original branch keeps going on success.