Stats dashboard network capacity new day bug

[baktun14]

When a new day starts (0:00 UTC), there's a short period of time (~15m) where the stats show -100% for all the network capacity. It auto-fixes itself after that period when the provider snapshots are taken.

The reason for this is we do a query on day and join on the provider snapshots and when the new day starts, there's no provider snapshots that is flagged as isLastSuccessOfDay yet. Link to the query in question

This causes confusion for anyone looking at the dashboard in that period of time.

• Return the previous day isLastSuccessOfDay provider snapshot when it's a new day and there's no provider snapshot yet.