fix: status updater prints the kind of ApisixUpstream as unknown

[bzp2010]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

https://the-asf.slack.com/archives/CUC5MN17A/p1763019082783669

https://github.com/apache/apisix-ingress-controller/blob/master/internal/controller/status/updater.go#L124

The types.KindOf function does not include the ApisixUpstream type, causing the state updater's logs to print its kind as Unknown.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[ronething]

#2622 resolved the same problem.

[bzp2010]

@ronething Then we ought to merge that pull request as soon as possible; it has already been approved.