Loan Policy Editor - Additional fields need to be set as 'required'

Purpose: To require staff users to select values for certain fields under various conditions.

Story: As a staff member, I want to be reminded that certain fields are conditionally required before saving and closing the Loan Policy Editor when adding or editing loan policies.

Scenario 1:

Issue 1: Add alert for required field - Fixed due date schedule
For Loan Policy where:

• Loanable = Y
• Loan type = Fixed
  'Fixed due date schedule' should be a required field
• Else: Flag field as required when user clicks 'Save and close' button. Alert should read "! Please make a selection" (note: an existing convention exists for non-select fields - "! Please fill out this field", which could be used if necessary)

Issue 2: Add alert for required field - Alternate fixed due date schedule for renewals
For Loan Policy where:

• Loanable = Y
• Loan type = Fixed
• Renewable = Y
• Renewal period different from original loan = Y
  'Alternate fixed due date schedule for renewals' should be a required field
• Else: Flag field as required when user clicks 'Save and close' button. Alert should read "! Please make a selection" (note: an existing convention exists for non-select fields - "! Please fill out this field", which could be used if necessary)

Issue 3: Add alert for required field - Alternate schedule for renewals
For Loan Policy where:

• Loanable = Y
• Loan type = Rolling
• Renewable = Y
• Renewal period different from original loan = Y
  'Alternate loan period for renewals' should be a required field
• Else: Flag field as required when user clicks 'Save and close' button. Alert should read "! Please fill out this field"