feat: Contour HTTPProxy health check support for issue # 22504

[gregbarasch]

Fixes #22504
This adds simple health checks for Contour HTTPProxy objects

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.85%. Comparing base (362dc66) to head (f94f073).
⚠️ Report is 542 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #22596   +/-   ##
=======================================
  Coverage   59.84%   59.85%           
=======================================
  Files         344      344           
  Lines       57715    57715           
=======================================
+ Hits        34541    34546    +5     
- Misses      20402    20405    +3     
+ Partials     2772     2764    -8     

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[davinci26]

is the message used for anything?

[gregbarasch]

Yeah -- this is what is returned to ArgoCD, and it links back with:

type HealthStatus struct {
	Status  HealthStatusCode `json:"status,omitempty"`
	Message string           `json:"message,omitempty"`
}

[gregbarasch]

https://github.com/argoproj/gitops-engine/blob/master/pkg/health/health.go#L37

[davinci26]

Fixes #22504

[gregbarasch]

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[crenshaw-dev]

A future iteration could pull the error messages and add them to the health message, but this at least gets the party started. :-) Thanks!