fix: Robustly parse file action responses and handle tooltip/URL children - #9547

Motivation

• Support server responses that wrap payload in the ocs.data envelope and use tooltip for success messages.
• Avoid failing when the root element is absent or when child elements are incomplete.
• Correctly resolve relative child url values against _accountUrl and improve logging for unsupported response elements.

Description

• Added #include <optional> and updated FileActionsModel::processRequest to extract ocs.data and the tooltip string from the JSON response.
• Use a fallback to ocs.data.root when top-level root is empty and prefer tooltip over the generic success message when present.
• Introduced setGenericResponse and parseChildResponse lambdas; parseChildResponse returns a std::optional<Response> and validates element, text, and url fields and resolves relative URLs against _accountUrl.
• Improved handling of child rows by using parsed responses when available, logging unsupported elements, and falling back to a generic response when parsing fails.

Testing

• Built the project with cmake and the changes compiled without errors.
• Ran the automated test suite with ctest, and all tests completed successfully.

Codex Task