chore(api): rename CertManagement webhook fields to generic names

[tariq-hasan]

What this PR does / why we need it:

Renames the CertManagement configuration fields from webhook-specific names to generic names, since the TLS certificate is used by the metrics server and the status server in addition to webhooks.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #3327

Checklist:

• Docs included if any changes are user facing

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[Copilot]

Pull request overview

This PR renames the CertManagement configuration fields from webhook-specific names (WebhookServiceName and WebhookSecretName) to generic names (ServiceName and SecretName) throughout the codebase, addressing issue #3327. This change is necessary because the TLS certificate is used not only by admission webhooks but also by the metrics server and status server.

Changes:

• Renamed struct fields and JSON tags in the CertManagement configuration type to use generic names
• Updated all usages of these fields across the codebase including the cert utility, trainjobstatus plugin, and main controller manager
• Updated documentation comments to clarify that the certificate serves multiple components
• Updated all configuration files, templates, and test fixtures to use the new field names

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/apis/config/v1alpha1/configuration_types.go	Updated CertManagement struct fields and documentation to use generic names
pkg/util/cert/cert.go	Updated Config struct to use the new field names
cmd/trainer-controller-manager/main.go	Updated references to use new field names when calling cert.ManageCerts
pkg/runtime/framework/plugins/trainjobstatus/trainjobstatus.go	Updated usage and removed obsolete TODO comment
pkg/apis/config/v1alpha1/defaults.go	Updated default value setting to use new field names
pkg/config/config_test.go	Updated all test fixtures and configuration examples
pkg/runtime/framework/plugins/trainjobstatus/trainjobstatus_test.go	Updated test configurations
manifests/base/manager/controller_manager_config.yaml	Updated manifest YAML
charts/kubeflow-trainer/values.yaml	Updated Helm values
charts/kubeflow-trainer/templates/manager/configmap.yaml	Updated Helm template
charts/kubeflow-trainer/tests/manager/configmap_test.yaml	Updated Helm test assertions
charts/kubeflow-trainer/README.md	Updated auto-generated documentation