Fix Docker image ID test for Docker 29

[JamieMagee]

GitHub Actions runners were updated to Docker 29.1.x on February 9. Docker 29 makes the containerd image store the default for fresh installs, which changes how image IDs are reported.

With the legacy graphdriver, docker inspect returned the config digest as the image ID. With the containerd image store, it returns the manifest digest instead. The test image hasn't changed -- both digests are valid for it -- but DockerService_PopulatesBaseImageAndLayerDetailsAsync was hardcoded to expect only the config digest.

This updates the assertion to accept either digest, so the test passes on both old and new Docker versions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.7%. Comparing base (a8222d2) to head (aec04e5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1633   +/-   ##
=====================================
  Coverage   90.7%   90.7%           
=====================================
  Files        444     444           
  Lines      39709   39710    +1     
  Branches    2418    2418           
=====================================
+ Hits       36029   36031    +2     
  Misses      3187    3187           
+ Partials     493     492    -1     

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[JamieMagee]

Verification test failures are expected. We are comparing the output from Docker 29, with the old, cached, output from an earlier version of Docker. The verification test output will be updated and cached with Docker 29 after merge to main.