Update merge details text for restructured widget

What does this MR do and why?

Updates the text in the closed, merged, auto merging, and merged widget when the restructured widget flag is enabled.

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Closes #353610 (closed)