Refactor: route DataNode.read() and write() to _DataNodeManager

[trgiangdo]

What type of PR is this? (check all applicable)

• Refactor
• Feature

Description

This PR reroutes the DataNode.read() and write() methods to call to the manager methods.

Related Tickets & Documents

• Related Issue https://github.com/Avaiga/taipy-enterprise/issues/651

[Copilot]

Pull Request Overview

This PR refactors how data nodes perform read and write operations by routing these operations through the _DataManagerFactory’s manager methods. The changes include updating multiple test files to call the new _read, _append, and _write methods instead of using read_or_raise, as well as streamlining the NoData exception messaging.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/core/data/test_read_parquet_data_node.py	Updated test to assert NoData using manager’s _read method.
tests/core/data/test_read_excel_data_node.py	Replaced calls to read_or_raise with manager’s _read in tests.
tests/core/data/test_read_csv_data_node.py	Updated test to use the manager’s _read method for NoData conditions.
tests/core/data/test_pickle_data_node.py	Adjusted test to assert NoData using the manager’s _read method.
tests/core/data/test_json_data_node.py	Refactored test to call manager’s _read instead of read_or_raise.
tests/core/data/test_in_memory_data_node.py	Updated test to use the manager’s _read method for NoData scenarios.
tests/core/data/test_data_node.py	Updated test to assert NoData using the manager’s _read method.
taipy/core/exceptions/exceptions.py	Simplified the NoData exception docstring.
taipy/core/data/data_node.py	Delegated read(), write(), and append() operations to the manager methods.
taipy/core/data/_data_manager.py	Introduced _read, _append, and _write methods to handle data node operations.
taipy/core/_orchestrator/_dispatcher/_task_function_wrapper.py	Updated input reading to use the manager’s _read method.

[jrobinAV]

We need to keep the public API.

Besides this, we may want to add non-regression tests on the new methods in the data manager.