ignore process instance not found in terms of sentry notification

spiffworkflow-backend/realmstuff/master-realm.json

@@ -2001,4 +2001,4 @@
   "clientPolicies" : {
     "policies" : [ ]
   }
-}
+}

spiffworkflow-backend/src/spiffworkflow_backend/exceptions/api_error.py

@@ -234,7 +234,7 @@ def should_notify_sentry(exception: Exception) -> bool:
     """Determine if we should notify sentry.
 
     We want to capture_exception to log the exception to sentry, but we don't want to log:
-      1. ApiErrors that are just invalid tokens
+      1. ApiErrors that we expect to happen and that don't indicate bugs
       2. NotAuthorizedError. we usually call check-permissions before calling an API to
          make sure we'll have access, but there are some cases
          where it's more convenient to just make the call from the frontend and handle the 403 appropriately.
@@ -242,6 +242,9 @@ def should_notify_sentry(exception: Exception) -> bool:
     if isinstance(exception, ApiError):
         if exception.error_code == "invalid_token":
             return False
+        # when someone is looking for a process instance that doesn't exist or that they don't have access to
+        if exception.error_code == "process_instance_cannot_be_found":
+            return False
     if isinstance(exception, NotAuthorizedError):
         return False
     return True