Remove Docker bundling in SageMaker model pkg promote pipeline

[clokep]

Describe your changes

This removes the custom Docker image used for bundling assets in the SageMaker model package promote pipeline stack.

It is unnecessary since the s3_assets.Asset construct can natively zip a directory (emphasis mine):

path: The disk location of the asset.

The path should refer to one of the following:

• A regular file or a .zip file, in which case the file will be uploaded as-is to S3.
• A directory, in which case it will be archived into a .zip file and uploaded to S3.

We are already providing the directory name as the path so it'll be automatically zipped.

Issue ticket number and link

Related to #193 as it is removes an image/asset to pull during deployment.

Checklist before requesting a review

• I updated CHANGELOG.MD with a description of my changes
• If the change was to a module, I ran the code validation script (scripts/validate.sh)
• If the change was to a module, I have added thorough tests
• If the change was to a module, I have added/updated the module's README.md
• If a module was added, I added a reference to the module to the repository's README.md
• I verified that my code deploys successfully using seedfarmer apply

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[malachi-constant]

AWS CodeBuild CI Report

• CodeBuild project: AIOpsModuleTestsInfrastruct-doMLXEYsnmxr
• Commit ID: 7c9ef75
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[kukushking]

Thanks!