Remove unnecessary toasts #8961
Description
Per https://primer.style/accessibility/toasts/:
There does not need to be a secondary form of reinforcement to communicate success, as it should be self-evident—including a toast to communicate this success may ironically lessen a sense of trust.
We have many toasts of this kind in ZDS. We can and should remove them if they are reliable and self-evident actions. Some that are coming to mind are changing the theme or any setting really, but there are bound to be more. Just grep for toast\.\(