[Issue] Optimize loading of media gallery when editing a product

[m2-assistant]

This issue is automatically created based on existing pull request: #32818: Optimize loading of media gallery when editing a product

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Description (*)

This PR aims to optimize the loading of the gallery tab when editing a product with many images, by avoiding redundant operations.

In a real-world example with a product with nearly 300 images, loading the gallery was more than 10 times faster after applying the changes.

Related Pull Requests

Fixed Issues (if relevant)

Manual testing scenarios (*)

1. Create a product.
2. Add or import a hundred images.
3. Edit the product again, opening the gallery tab is (very) slow.

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)