[release-1.16] Ensure ContainerHealthy condition is set back to True

[knative-prow-robot]

This is an automated cherry-pick of #15503

A revision is now set to ContainerHealthy=True when it has ready replicas

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, knative-prow-robot

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[codecov]

Codecov Report

Attention: Patch coverage is 80.64516% with 6 lines in your changes missing coverage. Please review.

Project coverage is 83.51%. Comparing base (b17688f) to head (3a626aa).
Report is 1 commits behind head on release-1.16.

Files with missing lines	Patch %	Lines
pkg/testing/functional.go	62.50%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.16   #15712      +/-   ##
================================================
- Coverage         83.56%   83.51%   -0.05%     
================================================
  Files               219      219              
  Lines             17427    17455      +28     
================================================
+ Hits              14563    14578      +15     
- Misses             2494     2505      +11     
- Partials            370      372       +2     

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[dprotaso]

/override "test (v1.28.x, kourier-tls, runtime)"

[knative-prow]

@dprotaso: Overrode contexts on behalf of dprotaso: test (v1.28.x, kourier-tls, runtime)

In response to this:

/override "test (v1.28.x, kourier-tls, runtime)"

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