fix: knative deployer should choose last built image by default

[lkingland]

The default deploy image should be the last one built if available.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.15%. Comparing base (431d24e) to head (6ef9e75).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/knative/deployer.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3100      +/-   ##
==========================================
+ Coverage   58.41%   59.15%   +0.73%     
==========================================
  Files         134      134              
  Lines       17263    17266       +3     
==========================================
+ Hits        10085    10213     +128     
+ Misses       6246     6092     -154     
- Partials      932      961      +29     

Flag	Coverage Δ
e2e-tests	40.35% <0.00%> (+1.33%)	⬆️
integration-tests	53.89% <0.00%> (+1.63%)	⬆️
unit-tests	46.24% <0.00%> (+<0.01%)	⬆️

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[gauron99]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, lkingland

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[gauron99]

/retest-required

[gauron99]

this unit test fail seems to be caused by go bump to 1.25; Im fixing this elsewhere

[gauron99]

/retest-required