Dsc 807

This request include addition of email notification of an EAD ingest job for the following stage:
- EAD file uploaded
   - EAD ingest require QA notification is sent if the EAD file is uploaded and work collection is created successfully.
   - EAD ingest failed notification is sent if the EAD file failed to be uploaded due to various reasons including first EAD parsing error encountered.

- EAD work collection is acquitted (i.e. saved and finalised).
  - EAD ingest completed notification is sent.