Reject failed Docker image builds instead of hanging

[cristianrgreco]

Summary

• propagate Docker image build startup failures to callers
• reject when Docker image build streams emit errors
• add focused unit coverage for both rejection paths
• enable the invalid Docker target integration regression

Verification

• red: added the build-start rejection regression against the pre-fix implementation; it received "timeout" instead of "rejected" and Vitest reported an unhandled build failed rejection
• red: added the build-stream error regression with stream error listeners temporarily removed; it received "timeout" instead of "rejected" and Vitest reported an unhandled build failed exception
• red: the invalid Docker target integration path previously hung until terminated
• green: npm test -- packages/testcontainers/src/container-runtime/clients/image/docker-image-client.test.ts packages/testcontainers/src/generic-container/generic-container.test.ts -t "rejects when the Docker image build cannot start|rejects when the Docker image build stream errors|should throw an error for a target stage that does not exist"
• npm run format
• npm run lint
• npm run check-compiles
• git diff --check

Test results

• focused green suite: 3 passed, 49 skipped

Compatibility

This is a backward-compatible bug fix. Successful Docker image builds retain their existing behavior.

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