Delete dataset trigger function uses wrong entity type

[anushka-singh]

Describe the bug

Delete dataset trigger function uses entity type as 'Dataset' instead of 'S3-Dataset'. Due to this, when a dataset is deleted, its corresponding entry is not removed from attached_metadata_form table.

Add a new alembic script to change the trigger function created.

How to Reproduce

*P.S. Please do not attach files as it's considered a security risk. Add code snippets directly in the message body as much as possible.*

Expected behavior

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Your project

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Screenshots

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OS

Mac

Python version

3.9

AWS data.all version

2.7

Additional context

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