Fix: additionalPropertis in openapi schema converted to uischema wrongly

[chivalryq]

Description of your changes

The meaning of additionalProperties.has is wrongly used. Then default uischema of gateway is wrongly generated.

Ref: https://swagger.io/docs/specification/data-models/dictionaries/

Fixes kubevela/kubevela#6165

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.05 ⚠️

Comparison is base (76a39a7) 59.07% compared to head (82767a6) 59.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #861      +/-   ##
==========================================
- Coverage   59.07%   59.03%   -0.05%     
==========================================
  Files         114      114              
  Lines       19795    19795              
==========================================
- Hits        11693    11685       -8     
- Misses       6673     6677       +4     
- Partials     1429     1433       +4     

Flag	Coverage Δ
apiserver-unittests	32.20% <0.00%> (+0.03%)	⬆️
server-e2e-tests	48.43% <100.00%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/server/domain/service/definition.go	74.59% <100.00%> (+1.91%)	⬆️

... and 9 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.