chore: remove type in dataset

[ThibaultFy]

Companion

• https://github.com/Substra/substra/pull/405 (main)
• https://github.com/Substra/substra-documentation/pull/412
• https://github.com/Substra/substrafl/pull/202
• https://github.com/Substra/substra-backend/pull/860
• https://github.com/Substra/substra-tests/pull/337
• https://github.com/Substra/orchestrator/pull/394

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