Add notification on selection of invalid date

[AbhipsaGuru1012]

In the dashboard when we click on 'New Appointment' and if we enter an invalid date the appointment still gets created and is reflected in the inventory.

Add a new toast notification that pops up when the user selects an invalid date.
Reference for the same has been provided below.

[Valliammai-SM]

@AbhipsaGuru1012 assign this to me

[AbhipsaGuru1012]

@AbhipsaGuru1012 assign this to me

Please go ahead, @Valliammai-SM

Happy Learning :)