Fix export CSV to retrieve all assessement entries

[josh1248]

Resolves #2814

Description

Resolves the issue of export CSV being unable to export all entries due to backend pagination. The solution is to connect to a backend endpoint outside of the Redux loop so that data can be exported independently of what is shown to the user. (This will be an admin-only button to avoid excess server fees)

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] Code quality improvements

How to test

Start up both the updated backend and updated frontend.

• Enter the 'Grading' tab.
• Click the 'Export CSV' button at the grading table.
• If you are logged in as an admin, you will receive a notification to download the CSV file.
• If you are logged in as a staff, you will receive a 401 error.

Checklist

• [ ] I have tested this code
• [ ] I have updated the documentation

[coveralls]

Pull Request Test Coverage Report for Build 11869868280

Details

• 2 of 17 (11.76%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 31.309%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/pages/academy/grading/Grading.tsx	0	4	0.0%
src/commons/sagas/RequestsSaga.ts	2	13	15.38%
<!--	Total:	2	17	11.76%	-->

Totals
Change from base Build 11568075789:	-0.01%
Covered Lines:	4835
Relevant Lines:	14568

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💛 - Coveralls