Show how many repos match each filter tab (All, Active, Failed, Pending)

[KofTwentyTwo]

When I'm syncing a larger org, the filter tabs above the repository table (All, Active, Failed, Pending) don't tell me anything until I click them. I keep flipping to Failed just to see whether anything failed.

Could the tabs show the count of matching repositories after the label, like All (73) · Active (2) · Failed (1) · Pending (70), and update live while a sync runs? That way the state of a sync is readable at a glance from the tab strip, and an empty Failed tab is obvious without clicking it.

Tracked as #118.