[nightly] Update common Docker engineering infrastructure with latest#7016
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## Summary Fix Windows PR validation failing because ImageBuilder is not pulled. The breaking behavior was added in #1947. Job-specific init steps (customBuildInitSteps, customGenerateMatrixInitSteps, etc.) were being merged into customInitSteps before being passed to init-common.yml. This caused init-imagebuilder.yml to skip the default ImageBuilder pull when any job-specific steps were provided, since it checks if customInitSteps is non-empty. ## Changes - Add separate parameters for job-specific init steps in job templates: - `customBuildInitSteps` in build-images.yml - `customCopyBaseImagesInitSteps` in copy-base-images.yml - `customGenerateMatrixInitSteps` in generate-matrix.yml - Update build-and-test.yml to pass these parameters separately instead of merging them - Add clarifying comments to distinguish the two types of init steps ## Testing Testing via dotnet/dotnet-docker#7016
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Updates the common Docker engineering infrastructure with latest changes from the dotnet/docker-tools repo.