feat: Introduce skipping of automatic event responses per task handler

[warber]

closes keptn/keptn#8718

This PR introduces the possibility to skip automatic event responses (sending of started/finished events by the sdk) on a per task handler basis.
Usage:

log.Fatal(sdk.NewKeptn(
	serviceName,
	sdk.WithTaskEventHandler(
		echoTriggeredEventType,
		NewEchoHandler(), sdk.TaskHandlerOptions{
			SkipAutomaticResponse: true,
		}),
	sdk.WithLogger(logrus.StandardLogger()),
).Start())

[codecov]

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[sonarcloud]

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