Proform attachments

[kewitham]

add the ability to attach documents in the proform process (internal intake staff only) Provide visual indication that there is a scanned letter or voicemail attachment to the report

What does this change?

This PR adds the ability to attach documents to the internal intake form rather than having to add the attachments within the report.

Screenshots (for front-end PR):

Checklist:

Author

• [ ] If this is a story, run locally and check to make sure all Acceptance Criteria are met. (If any criteria are unclear, ask about them.).
• [ ] Check for, document, and establish a testing plan for any behavior that may vary across environments or is otherwise difficult to test.
• [ ] Check for accessibility.
• [ ] Tests pass.

Reviewer

• [ ] If this is a story, run locally and check to make sure all Acceptance Criteria are met. (If any criteria are unclear, ask about them.).
• [ ] Check for any behavior that may vary across environments or is difficult to test, and ensure that it is well-understood, documented, and that there is a testing plan in place.
• [ ] Re-check for accessibility.
• [ ] Tests pass.

Notes for reviewer:

See PR instructions doc for full pull request review instructions.