Modify transformationPlugins contract to return Object to support One… #3225

Job	Run time
gradle-tests	32m 42s
link-checker	4s
console-python-tests (lib/console_link)	27s
console-python-tests (cluster_tools)	2m 1s
node-tests (./deployment/cdk/opensearch-service-migration)	40s
python-e2e-tests	14m 32s
console-python-tests (console_api)	26s
python-lint	9s
node-tests (./deployment/migration-assistant-solution)	25s
style-check	47s
workflow-info	2s
all-ci-checks-pass	1s
	52m 16s

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