This functionality does not yet exist in Phabricator. You can used bin/audit delete to clear out mis-triggered audits from the command line.

A "bulk workflow" feature is being tracked in T5815 and maybe in T9132.

Please note that after running bin/audit delete, you have to run bin/audit synchronize --all to clear the audit status of commits.
Keep in mind that in a large instance --all may not be the best option.