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/connector/staff/mutations.gql

@@ -15,8 +15,8 @@ mutation CreateStaff(
   $reliabilityScore: Int
 
   $bio: String
-  $skills: Any
-  $industries: Any
+  $skills: [String!]
+  $industries: [String!]
   $preferredLocations: [String!]
   $maxDistanceMiles: Int
   $languages: Any
@@ -106,8 +106,8 @@ mutation UpdateStaff(
   $reliabilityScore: Int
 
   $bio: String
-  $skills: Any
-  $industries: Any
+  $skills: [String!]
+  $industries: [String!]
   $preferredLocations: [String!]
   $maxDistanceMiles: Int
   $languages: Any