Don't model a healthcheck operation in the example Pokemon service

[david-perez]

smithy-rs/codegen-core/common-test-models/pokemon-common.smithy

Lines 86 to 91 in 8375272

	/// Health check operation, to check the service is up
	/// Not yet a deep check
	@readonly
	@http(uri: "/ping", method: "GET")
	operation CheckHealth {
	}

You typically don't want to model a healthcheck operation since you don't want users to call it. It's not an inherent property of a service but rather an out-of-band implementation-defined (probably dictated by your particular load balancer / proxy / compute platform) route. For example, we already offer aws_smithy_http_server::layer::alb_health_check for ALB healthchecks.