Update process-notification limit to align with API limit

**Background**
During PT T4A uploads `429 Too many requests` errors were received in the process to send emails based on uploaded files. Our API rate limit is 1000 calls per minute.

**Acceptance Criteria**

No file, test, or entry point is named. Start by locating the process that sends emails based on uploaded files and identify its notification limit, then compare it with the API limit of 1000 calls per minute. Done means the process-notification limit aligns with that API limit and the upload workflow no longer produces the reported 429 errors.

Written by the indexing model from the issue text.