[Issue] Rectify checkout_index_index.xml layout file cross modules.

[m2-assistant]

This issue is automatically created based on existing pull request: #30711: Rectify checkout_index_index.xml layout file cross modules.

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Description (*)

Removed duplicate layout XML code from checkout_index_index.xml of other modules.

Related Pull Requests

#30538

Fixed Issues (if relevant)

1. This is code improvement.

Manual testing scenarios (*)

N/A

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)
• All automated tests passed successfully (all builds are green)

[engcom-November]

We are considering this as feature request as this is existing behavior of Magento and a code improvement but not a bug.