Add Database Export and Import APIs

[tlaverdure]

This pull request introduces support for new database export and import APIs, expands privilege management, and updates several API response models for consistency. It also includes minor workflow and test improvements. The most important changes are grouped below.

API Client Enhancements:

• Added support for new database export (DatabaseExportApi, DatabaseExportEndApi, DatabaseExportPartApi) and import (ImportApi, ImportChunkApi) APIs in ApiClient, including corresponding accessor methods. [1] [2] [3]

Privilege Management:

• Introduced new privilege constants DATABASE_EXPORT and DATABASE_IMPORT in Privilege.php, and included them in the list of allowable enum values. [1] [2]

API Response Model Consistency:

• Standardized the data property types in user and token response models to use UserStoreResponse, UserShowResponse, UserUpdateResponse, and TokenShowResponse instead of controller-specific response types, updating both type hints and docblocks in the relevant model files. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

Test and Workflow Improvements:

• Updated the Docker image and environment variables for integration tests to use the latest image and new storage path variables.
• Fixed minor issues in test runner argument preparation and improved request object handling. [1] [2]
• Corrected the documentation in the OpenAPI generator workflow to reference the right composer script.