Threshold and Invalid Input Fix

[Bl20052005]

Closes #536 and #531

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[waalbert]

Awesome start Bo!

Can you also add frontend form validation for submitting a review score and also frontend form and backend validation for setting the thresholds?

Note for your reference: we will be moving the setting thresholds form to the director's dashboard, so since this PR is small, can you also remove HackerThresholdInputs from HackerApplicants? We will add HackerThresholdInputs to the director's dashboard in another PR.

[waalbert]

Also, make sure to add form validation in HackerThresholdsInput for valid threshold values: 0 to 10 and make sure that the accept threshold value must be greater than or equal to the waitlist threshold value .

Note: when the input field is empty, the value of -1 is sent to /api/admin/set-thresholds for when the accept or waitlist threshold value should stay the same.

Actually forget what I said about moving HackerThresholdsInput to the director's page in another PR. I've decided to keep it here on the same page, but make it only visible for directors. There is an authorization roles check called isDirector that can check to see if the user is a director.

[waalbert]

Almost done! A few more nitpicks

[waalbert]

Thanks for the work Bo!