Race & Ethnicities: Replace activeMetricKey and activeSystem with URL params

[mxosman]

Description of the change

Replace all instances of the MetricConfig store's activeMetricKey and activeSystem with URL params & updates related Race & Ethnicities components. [Huge shout out to all of @ivan-kishko work with implementing the routing]

Related issues

Closes #185

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[terryttsai]

Looks awesome!

[mxosman]

Looks awesome!

Thank you, Terry!