Update student form to validate new separate minimum offering days for Fulltime vs Parttime.

[JasonCTang]

To validate the study dates when student enters them manually according to the minimum offering days for the intensity.

Acceptance Criteria

• Emulate current behaviour, just modify to validate against the appropriate minimum offering days for the intensity.
• Change the messaging for scenario where number of study days is below the minimum for the intensity (two options):
  • Perform quick investigation to determine if it is possible to use a variable in the form.io message to dynamically display the minimum offering days specific for the selected intensity: "Invalid Study Period, Dates must be between [variable] and 365 days"
  • If it is not simple and straight forward, just use the following static text: "Invalid Study Period, Dates must be between the minimum (42 for Part Time and 84 for Full Time) and the maximum (365 days)"