[Bug] get_pipeline_custom_tags function missing in pipeline.py

In mlops-multi-account-cdk/mlops-sm-project-template/seed_code/build_app/buildspec.yml buildspec is calling for module name: ml_pipelines.training.pipeline

mlops-multi-account-cdk/mlops-sm-project-template/seed_code/build_app/ml_pipelines/_utils.py calling for : __import__(module_name, fromlist=["get_pipeline_custom_tags"]). However "get_pipeline_custom_tags" function does not exist in pipeline.py

Start by reading seed_code/build_app/buildspec.yml and seed_code/build_app/ml_pipelines/_utils.py, then inspect ml_pipelines/training/pipeline.py. Trace how _utils.py imports get_pipeline_custom_tags and determine the expected behavior from its caller; done means the module import no longer fails during the build.

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