Display warning to audit admins when they edit contests after jurisdictions have uploaded candidate-totals-by-batch files

[arsalansufi]

Since this triggers reprocessing of candidate-totals-by-batch files, which may surface new errors to jurisdiction admins and catch them by surprise, unless audit admins proactively communicate out

See https://votingworks.slack.com/archives/CKCVA0F9S/p1709773686330979 for more context