Search needs to put React components into loading state

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If you search for an Epoch through the explorer-app while already on an Epoch page, explorer-app will load the Epoch summary while still displaying the old Blocks component due to them being separate queries with different response times. What should happen is when you search, the components should be put into a loading state until the data is retrieved - preferably with each component displaying ASAP rather than waiting for the whole page to be ready.