Add CS leaders prize to scholarship status

[megcrenshaw]

Adds the "CS Leaders Prize" as an option for scholarship.

Tested manually:

On backend, when I check the status, I see

[development] dashboard > Pd::ScholarshipInfo.all.pluck(:scholarship_status)
   (1.6ms)  SELECT `pd_scholarship_infos`.`scholarship_status` FROM `pd_scholarship_infos`
=> ["yes_cs_leaders", "yes_cs_leaders"]

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Testing story

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Follow-up work

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Caching

PR Checklist:

• Tests provide adequate coverage
• Privacy and Security impacts have been assessed
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Pull Request is labeled appropriately
• Follow-up work items (including potential tech debt) are tracked and linked