Fix make docs for multi-group API operators

[stuggi]

The build_docs.sh script assumed all operator API types live directly under v1beta1/*_types.go, but nova-operator moved to a multi-group layout with types under nova/v1beta1/. The hardcoded ls glob failed for this structure.

Replace ls with find -path "/v1beta1/_types.go" to discover types in any v1beta1 subdirectory regardless of nesting depth.

[openshift-ci]

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[github-actions]

OpenStackControlPlane CRD Size Report

Metric	Value
CRD JSON size	322326 bytes (315KB)
Base branch size	322326 bytes
Change	+0.00%
Status	yellow — growing

Threshold reference

Color	Range	Meaning
🟢 green	< 300KB	Comfortable
🟡 yellow	300–400KB	Growing
🟠 orange	400–750KB	Concerning
🔴 red	> 750KB	Approaching 1.5MB etcd limit (cut in half to allow space for update)

[stuggi]

currently failing with https://github.com/openstack-k8s-operators/openstack-operator/actions/runs/24573462131/job/71852528687#step:6:1976

++ ls /home/runner/go/pkg/mod/github.com/openstack-k8s-operators/neutron-operator/api@v0.6.1-0.20260415055437-26247a82c50b/v1beta1/neutronapi_types.go
+ for SERVICE in ${SERVICE_PATH[@]}
+ CTLPLANE_PATHS+=($(ls ${SERVICE}))
++ ls '/home/runner/go/pkg/mod/github.com/openstack-k8s-operators/nova-operator/api@v0.6.1-0.20260413153813-b59b2a226c10/v1beta1/*_types.go'
ls: cannot access '/home/runner/go/pkg/mod/github.com/openstack-k8s-operators/nova-operator/api@v0.6.1-0.20260413153813-b59b2a226c10/v1beta1/*_types.go': No such file or directory
make: *** [Makefile:107: docs] Error 2
Error: Process completed with exit code 2.