feat: update preferredLocations field to List<String> across staff-related entities and mutations

- Changed preferredLocations from AnyValue to List<String> in GetStaffByIdStaff, GetStaffByUserIdStaffs, ListStaffStaffs, and UpdateStaffVariablesBuilder classes.
- Updated JSON serialization/deserialization for preferredLocations to handle List<String>.
- Modified Staff entity to include preferredLocations as List<String>.
- Adjusted ProfileSetupBloc and PersonalInfoBloc to accommodate changes in preferredLocations.
- Updated PersonalInfoRepositoryImpl to handle preferredLocations as List<String>.
- Refactored PersonalInfoContent and PersonalInfoForm to use locations instead of address.
- Updated GraphQL mutations and schema to reflect the new List<String> type for preferredLocations.

apps/mobile/packages/domain/lib/src/entities/users/staff.dart

@@ -44,6 +44,7 @@ class Staff extends Equatable {
     this.noShowCount,
     this.cancellationCount,
     this.reliabilityScore,
+    this.preferredLocations,
   });
   /// Unique identifier for the staff profile.
   final String id;
@@ -89,6 +90,9 @@ class Staff extends Equatable {
   /// The reliability score (0-100).
   final int? reliabilityScore;
 
+  /// Preferred work locations.
+  final List<String>? preferredLocations;
+
   @override
   List<Object?> get props => <Object?>[
         id,
@@ -105,5 +109,6 @@ class Staff extends Equatable {
         noShowCount,
         cancellationCount,
         reliabilityScore,
+        preferredLocations,
       ];
 }