[Backport 2.x] Fix custom prompt substitute with List issue in ml inference search response processor

[opensearch-trigger-bot]

Backport 49d4a01 from #2871

[mingshl]

passed all windows tests, rerunning linux 11 succeed. trying to rerun linux 17 and 21

[mingshl]

flaky test VisualizationsToolIT

 REPRODUCE WITH: ./gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.tools.VisualizationsToolIT.testVisualizationFound" -Dtests.seed=78E09CF9C4455CE9 -Dtests.security.manager=false -Dtests.locale=es-PA -Dtests.timezone=America/North_Dakota/New_Salem -Druntime.java=17

REPRODUCE WITH: ./gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.tools.VisualizationsToolIT.testVisualizationFound" -Dtests.seed=78E09CF9C4455CE9 -Dtests.security.manager=false -Dtests.locale=es-PA -Dtests.timezone=America/North_Dakota/New_Salem -Druntime.java=17

org.opensearch.ml.tools.VisualizationsToolIT > testVisualizationFound FAILED
    org.opensearch.client.ResponseException: method [DELETE], host [http://[::1]:33035], URI [/_plugins/_ml/models/XD83tpEBXM_8kiw3Ctf-], status line [HTTP/1.1 400 Bad Request]
    {"error":{"root_cause":[{"type":"status_exception","reason":"Model cannot be deleted in deploying or deployed state. Try undeploy model first then delete"}],"type":"status_exception","reason":"Model cannot be deleted in deploying or deployed state. Try undeploy model first then delete"},"status":400}