Restructure bulk_grades mocking / testing format

Description

In the bulk-grades repo, we have created a test “dummy” lms that we allow the code to call while running tests.

These tests / test infrastructure is unwieldy and fragile. We should re-structure these tests to use more explicit and ourposeful mocking than just allowing the fallthrough to the “fake” LMS api.

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Reporter

Jansen Kantor

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