chore(daemon): retrieve daemon heartbeats in batch

[rexledesma]

Summary

As the title. One call to retrieve all daemon heartbeats suffices to calculate daemon health.

Test Plan

existing pytest

[linear]

PLAT-1049 Refactor `get_daemon_status` to retrieve heartbeats in batch

we're calling this method once per daemon, which is a db call each time.

Can verify perf improvement by looking at https://app.datadoghq.com/databases?dbPanels=%5B%7B%22t%22%3A%22dbQueryPanel%22%2C%22qs%22%3A%22696f9dfc2070c388%22%2C%22dbType%22%3A%22PostgreSQL%22%7D%5D&dbPlanSignature=f5a1de1edb18e47f&dbType=PostgreSQL&start=1646083148759&end=1646086748759&paused=false in dogfood after deploying.

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[rexledesma]

Current dependencies on/for this PR:

• master
  • PR chore(daemon): retrieve daemon heartbeats in batch #6843 (this PR)

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