WorkerProcessStartedProbe only checks HasExited and throws a non-retryable
WorkerProcessLaunchException, so StartupProbeRetryAttempts and
StartupProbeRetryDelayMilliseconds configured a Polly retry that no shipped
probe could trigger. Real readiness is WorkerClient's WorkerReady handshake
under the same StartupTimeoutSeconds budget, so the probe now runs once and
the two options, their validation, the Polly pipeline (and the server's now
unused Polly.Core reference) and their docs are removed. A stale value in
configuration is ignored by the binder.
Tests: WorkerProcessLauncherTests.LaunchAsync_WhenStartupProbeFails_DoesNotRetryTheProbe,
WorkerOptions_HasNoStartupProbeRetryOptions (both fail on the old code).
Joseph Doherty
ff397b27be