Refactor staff data models to use List<String> for skills and industries

- Updated GetStaffByIdStaff, GetStaffByUserIdStaffs, ListStaffStaffs, and UpdateStaffVariablesBuilder classes to replace AnyValue with List<String> for skills and industries.
- Modified JSON serialization and deserialization logic accordingly.
- Adjusted ExperienceRepositoryImpl to handle List<String> for industries and skills.
- Updated GraphQL mutations and schema to reflect changes in data types for skills and industries.

backend/dataconnect/schema/staff.gql

@@ -61,8 +61,8 @@ type Staff @table(name: "staffs") {
 
   # Profile 
   bio: String
-  skills: Any #changed it for staffRole
-  industries: Any
+  skills: [String] #changed it for staffRole
+  industries: [String]
   preferredLocations: [String]
   maxDistanceMiles: Int 
   languages: Any