fix: add healthcheck in response body

[theweakgod]

Description

Fixes #10517 (https://github.com/apache/apisix/issues/10517) hold in another branch origin pr

Checklist

• [ ] I have explained the need for this PR and the problem it solves
• [ ] I have explained the changes or the new features added to this PR
• [ ] I have added tests corresponding to this change
• [ ] I have updated the documentation to reflect this change
• [ ] I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[Vacant2333]

hello, is the pr ready to review now? @theweakgod

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