fix: Ensure that MarkupExtension search behavior is consistent with winui

[yaobiao131]

…inui, and prioritize classes with Extension extensions

GitHub Issue (If applicable): closes #19801

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

When I created two classes named ResourcesExtension and Resources in same namespace, ResourcesExtension implemented MarkupExtension and Resource is a static class. It can be parsed to ResourcesExtension normally in winui, but in uno, it will first search for the static class Resources.

What is the new behavior?

The search behavior is consistent with winui, and classes with Extension extensions are searched first.

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

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[yaobiao131]

anything update?

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