Add user-visible change document to doc/changes

Author: leeskelvin

doc/changes/DM-44647.feature.md

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+Move pipeline-dot build from cmdLineFwk to builder.
+
+This ticket moves the pipeline-dot build from the cmdLineFwk package to the builder package.
+This is done to make the pipeline-dot build more accessible to other packages.
+As part of this change, output pipeline-dot files contain dimensions and storage classes for each dataset.
+This change also includes updates to existing unit tests to reflect the new output types.