[3.5] Backport healthcheck code cleanup#17000

Merged

serathius merged 6 commits intoetcd-io:release-3.5from siyuanfoundation:livez-bp-3.5-step1

Nov 27, 2023

+419-330

Commits on Nov 27, 2023

server: Use named struct initialization in healthcheck test

serathius
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siyuanfoundation
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server: Rename test case expect fields

serathius
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siyuanfoundation
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server: Run health check tests in subtests

serathius
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siyuanfoundation
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server: Refactor health checks

serathius
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siyuanfoundation
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server: Cover V3 health with tests

serathius
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siyuanfoundation
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server: Split metrics and health code

serathius
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siyuanfoundation
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