Delete dataset trigger function uses wrong entity type #1867
Description
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
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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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