feat: Migrate staff profile features from Data Connect to V2 REST API

- Removed data_connect package from mobile pubspec.yaml.
- Added documentation for V2 profile migration status and QA findings.
- Implemented new session management with ClientSessionStore and StaffSessionStore.
- Created V2SessionService for handling user sessions via the V2 API.
- Developed use cases for cancelling late worker assignments and submitting worker reviews.
- Added arguments and use cases for payment chart retrieval and profile completion checks.
- Implemented repository interfaces and their implementations for staff main and profile features.
- Ensured proper error handling and validation in use cases.

apps/mobile/packages/features/staff/availability/pubspec.yaml

@@ -19,8 +19,6 @@ dependencies:
     path: ../../../design_system
   krow_domain:
     path: ../../../domain
-  krow_data_connect:
-    path: ../../../data_connect
   krow_core:
     path: ../../../core
 
@@ -28,8 +26,6 @@ dependencies:
   equatable: ^2.0.5
   intl: ^0.20.0
   flutter_modular: ^6.3.2
-  firebase_data_connect: ^0.2.2+2
-  firebase_auth: ^6.1.4
 
 dev_dependencies:
   flutter_test: