[Admin] Set hacker score thresholds

[IanWearsHat]

Part of #510

• Insert document in MongoDB under settings collection similar to the following:

{
    _id: 'hacker_score_thresholds',
    accept: 8,
    waitlist: 5
}

• Insert document in MongoDB under users collection similar to the following:

{
    _id: 'edu.uci.app22',
    application_data: {
        pronouns: [
            'he',
            'she'
        ],
        ethnicity: 'Two-or-more',
        is_18_older: false,
        school: 'UC San Diego',
        education_level: 'third-year-undergrad',
        major: 'Software Engineering',
        is_first_hackathon: false,
        linkedin: null,
        portfolio: null,
        frq_change: 'dsad',
        frq_video_game: 'dsa',
        email: '[email protected]',
        resume_url: null,
        submission_time: ISODate('2024-12-20T17:32:59.973Z'),
        reviews: [
            [
                ISODate('2024-12-20T17:41:22.634Z'),
                'edu.uci.ian4',
                4
            ],
            [
                ISODate('2024-12-20T17:42:01.098Z'),
                'edu.uci.ian5',
                10
            ]
        ]
    },
    first_name: 'dwa',
    last_name: 'sds',
    roles: [
        'Applicant',
        'Hacker'
    ],
    status: 'ACCEPTED'
}

• Navigate to /admin/applicants/hackers
• Change the thresholds in the top right, reload, and see a change in the applicant's decision

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