Use PullIfNotPresent pull policy for auth-proxy image

[creydr]

Cleaning up a left over from testing the auth-proxy

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.20%. Comparing base (903c74c) to head (64bdfa2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...iler/integration/sink/resources/container_image.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8735      +/-   ##
==========================================
- Coverage   50.22%   50.20%   -0.02%     
==========================================
  Files         409      409              
  Lines       26659    26659              
==========================================
- Hits        13390    13385       -5     
- Misses      12430    12431       +1     
- Partials      839      843       +4     

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[Cali0707]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, creydr

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