Fail grade but mark as complete

[nus-pe-bot]

The module with a fail grade should not be marked as complete because student can not get MCs from it.

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_{[original: nus-cs2113-AY2223S1/pe-interim#869] [original labels: type.FeatureFlaw severity.Medium]}

[Zhai-Yuxin]

Team's Response

complete means the student has taken this module and received a grade. (failing is a grade too)

Duplicate status (if any):

Duplicate of #902