fix: Ensure x:Uid is set only when both name and namespace are correct

[AndrewKeepCoding]

GitHub Issue (If applicable): closes #19069

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

When a custom attached property with the name Uid is attached to an element, x:Uid might be associated with the target instead. This occurs because x:Uid is linked to an element solely by its name, not by both name and namespace.

What is the new behavior?

x:Uid won't be linked to an element unless both name and namespace are correct

PR Checklist

Please check if your PR fulfills the following requirements:

• Docs have been added/updated which fit documentation template (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Validated PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Associated with an issue (GitHub or internal) and uses the automatic close keywords.
• Commits must be following the Conventional Commits specification.

Other information

Internal Issue (If applicable):

[unodevops]

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[AndrewKeepCoding]

Is there anything I can do to help move this forward?

[jeromelaban]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[unodevops]

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[MartinZikmund]

@AndrewKeepCoding it seems the runtime tests are currently failing, can you try?

[AndrewKeepCoding]

@MartinZikmund I'll take a look in a few days. 🙂

[unodevops]

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[unodevops]

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[unodevops]

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[unodevops]

⚠️⚠️ The build 162952 has failed on Uno.UI - CI.