chore: use dockerhub instead of gcr

[tstirrat15]

Description

We've been seeing a lot of test flakes from dockertest failing to download images from the google container registry. This changes it to use the normal dockerhub container registry, which we've got creds for already.

Changes

• Use dockerhub instead of gcr

Testing

Review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.62%. Comparing base (7cf0595) to head (09a698a).
⚠️ Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (73.62%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2949      +/-   ##
==========================================
- Coverage   74.54%   73.62%   -0.92%     
==========================================
  Files         490      490              
  Lines       60385    60385              
==========================================
- Hits        45008    44450     -558     
- Misses      12227    12778     +551     
- Partials     3150     3157       +7     

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