Fix: order save updates only changed fields (#40147)

[marcinfr]

Order save() updates all fields instead of only changed ones, causing data loss in concurrent processes

Description (*)

When working with orders, I noticed that calling save() after changing a single field results in an UPDATE query on all fields, not just the modified ones.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes Order save() updates all fields instead of only changed ones, causing data loss in concurrent processes #40147

Manual testing scenarios (*)

1. Load an order (e.g. via OrderRepository or model load).
2. Modify one field (for example, a status).
3. Call save().
4. Check the executed SQL queries.

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[marcinfr]

@magento run all tests

[marcinfr]

@magento run Unit Tests