#539 Implement working functionality for the GET /program/:programAssessmentId/submissions/new route

[ZeyuanLi16]

Proposed changes

This pull request close #539 which includes

• GET /program/:programAssessmentId/submissions/new route
• route test
• service file functions related to the route(listParticipantProgramAssessmentSubmissions, createAssessmentSubmission)
• service file function test

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.
• [x] The appropriate label has been chosen for this pull request.
• [x] The correct project has been selected for this pull request.
• [x] All commits in this branch, including merge commits, begin with the issue number and a pound sign.
• [x] Tests have been added, where appropriate; or, no tests are relevant for this pull request.
• [x] This pull request contains UI changes, and screenshots of those UI images appear below; or, this pull request contains no UI changes.

[ZeyuanLi16]

EOD update Add the route and some route tests according to the issue description. The route had been fully manual tested.

Up next, finishing remaining route tests and add service file function tests.