Review and Clean up Exploration types & Veda Types for Dataset Layers

[sandrahoang686]

Context:
Related to comment from PR here => #1361 (comment)

We need to review the data types between the /exploration/types.d.ts file and the /types/veda.ts file. There is duplication happening. We should also check the files that references these types. For example there is typecasting happening which looks to be masking an issues of how we may be defining these types or some mis-transformations/reconciling along the way like here =>

veda-ui/app/scripts/components/common/blocks/scrollytelling/index.tsx

Lines 165 to 167 in 93ae948

	const layer = layers?.find(
	(l) => l.id === layerId
	) as EADatasetDataLayer | null;