Modify transformationPlugins contract to return Object to support One to Many transformations #3223

Job	Run time
console-python-tests (lib/console_link)	27s
gradle-tests	32m 31s
console-python-tests (cluster_tools)	2m 2s
console-python-tests (console_api)	24s
link-checker	7s
node-tests (./deployment/cdk/opensearch-service-migration)	45s
python-e2e-tests	14m 26s
node-tests (./deployment/migration-assistant-solution)	27s
python-lint	6s
style-check	30s
workflow-info	3s
all-ci-checks-pass	1s
	51m 49s

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