Student: Step Parent Waiver appeal validation

[Joshua-Lakusta]

As a student user I want to only see step parent waiver when 2 parents are on the application to avoid confusion.

Acceptance Criteria

• [ ] Create a validation that only shows the step parent waiver appeal when the application selected has 2 parents attached.
• [ ] Block students from interacting with the appeal drop down until an application is selected to allow for validation to occur.

Additional Context

• The appeal should not exist if there isn't at least 2 parents and leaving it as is would confuse students and increase wasted effort of ministry staff.

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