fix(oapi): fix default in size query parameter (backport of #12936)

[kumahq]

Automatic cherry-pick of #12936 for branch release-2.8

Generated by action

cherry-picked commit 3ab8d8d

⚠️ ⚠️ ⚠️ Conflicts happened when cherry-picking! ⚠️ ⚠️ ⚠️

On branch release-2.8
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Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   api/mesh/v1alpha1/mesh/rest.yaml
	deleted by us:   api/mesh/v1alpha1/meshgateway/rest.yaml
	both modified:   docs/generated/openapi.yaml
	both modified:   pkg/core/resources/apis/hostnamegenerator/api/v1alpha1/rest.yaml
	both modified:   pkg/core/resources/apis/meshexternalservice/api/v1alpha1/rest.yaml
	deleted by us:   pkg/core/resources/apis/meshmultizoneservice/api/v1alpha1/rest.yaml
	both modified:   pkg/core/resources/apis/meshservice/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshaccesslog/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshcircuitbreaker/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshfaultinjection/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshhealthcheck/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshhttproute/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshloadbalancingstrategy/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshmetric/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshpassthrough/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshproxypatch/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshratelimit/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshretry/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshtcproute/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshtimeout/api/v1alpha1/rest.yaml
	deleted by us:   pkg/plugins/policies/meshtls/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshtrace/api/v1alpha1/rest.yaml
	both modified:   pkg/plugins/policies/meshtrafficpermission/api/v1alpha1/rest.yaml
	both modified:   tools/policy-gen/templates/endpoints.yaml

no changes added to commit (use "git add" and/or "git commit -a")

Changelog: feat(openapi): generate a spec with all resources

[jijiechen]

Closing since this PR is generated by a test run of the new "backport" workflow