// WithClientMetrics sets the client metrics for the RuntimeInfo.
// This function returns a RuntimeInfoOption that configures how client metrics
// are collected, including setting a default scrape target if none is provided
// and parsing the scrape target string into a valid selector.
//
// Parameters:
// - clientMetrics (datav1alpha1.ClientMetrics): The client metrics configuration to be applied.
//
// Returns:
// - (RuntimeInfoOption): A function that updates the RuntimeInfo with the specified metrics configuration.