[testing] Fix image build validation for unmerged avalanchego commit #1349
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Why this should be merged
#1318 added image build validation, but only included support for testing against published avalanchego versions. Since subnet-evm CI frequently needs to target unmerged avalanchego commits, this oversight can break CI for version bump PRs.
How this works
Updates the test to build the avalanchego image locally if it cannot be pulled. The logic that maintained the local avalanchego clone was extracted from the antithesis test script for reuse in the image build test script.
How this was tested
CI validates against regression, and the changes in this PR were validated by rebasing the changes against the latest bump PR that targets an unmerged avalanchego commit and confirming that the test still passed.
How is this documented
Code comments.