Add webhook service endpoint readiness check before creating default …

[nocturnalastro]

…PtpOperatorConfig

The operator could fail to create the default PtpOperatorConfig on startup due to a race condition: the local webhook server is ready but the Kubernetes Service endpoints are not yet populated, causing the API server's validating webhook call to fail with "no endpoints available". Without retry, the default config is never created and the linuxptp-daemon DaemonSet is never spawned.

Extend waitForWebhookServer to also verify the webhook-service is reachable via cluster DNS (using a TCP dial) before proceeding to create the default config. This ensures the endpoint controller has had time to populate the Service endpoints. Use goroutine-local err variables to avoid a data race with mgr.Start, and check ctx.Done() so the goroutine terminates cleanly on manager shutdown.

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