kpa: simplify computeActiveCondition logic

[andrew-delph]

Making changes to the pa active status has becomes difficult. This change breaks down some of the logic so that it is more readable. No changes to test cases were made as it doesn't actually change the logical cases.

This pr is created from the comments found here: #14607 (comment)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

Hi @andrew-delph. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[dprotaso]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.23%. Comparing base (64b7126) to head (df191b8).
Report is 56 commits behind head on main.

❗ Current head df191b8 differs from pull request most recent head 351d7d9. Consider uploading reports for the commit 351d7d9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14940      +/-   ##
==========================================
+ Coverage   84.22%   84.23%   +0.01%     
==========================================
  Files         213      213              
  Lines       16635    16641       +6     
==========================================
+ Hits        14011    14018       +7     
- Misses       2278     2279       +1     
+ Partials      346      344       -2     

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[dprotaso]

If this fixes a problem can you add a test (unit or e2e) that demonstrates it?

[dprotaso]

The failures seem legit. The original test surfaces ensures we surface image pull failure as the err message.

image_pull_error_test.go:86: Failed to validate revision state: the Revision image-pull-error-bikcsjns-00001 ReadyCondition = (Reason="ProgressDeadlineExceeded", Message="Initial scale was never achieved"), wantReasons: [ImagePullBackOff ErrImagePull]

[andrew-delph]

Hello @dprotaso ,
I added a unit test to cover the image pull error caught in the e2e tests and updated the code.