#579 Assessments detail page needs to be wired up to the backend

[ZeyuanLi16]

Proposed changes

This close #579 integrating AssessmentDetailPage to three backend api:

1. GET /program/:programAssessmentId/submissions/new
2. GET /submission/:submissionId
3. PUT /submission/:submissionId

It is blocked due to the assessment is set before it is loaded. causing it to return error alert.

Checklist

• [x] Related issue appears at beginning of pull request title with pound sign, and title describes the changes being proposed.
• [x] Related issue is linked in pull request description using closing keywords.
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