feat(insights): migrate "average cold start" chart to eap

[DominikB2014]

1. Add a new useTopNDiscoverSeries hooks, these are mostly a copy of the useDiscoverSeries, but there's different processing of the response and a slightly different return type. This will make it much easier to migrate to eap
2. Use the new hook in the "average cold start chart" on the screen summary
   

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

Additional details and impacted files

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+ Coverage   32.87%   78.40%   +45.53%     
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  Files        8721    10297     +1576     
  Lines      486406   584226    +97820     
  Branches    22624    22562       -62     
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+ Hits       159896   458067   +298171     
+ Misses     326078   122848   -203230     
- Partials      432     3311     +2879