NoSQL group 3

[rasswanth-s]

Description

Removed Unused SQL table

• [x] ledger
• [x] entity
• [x] mechanism
• [x] environment

Affected Dependencies

List any dependencies that are required for this change.

How has this been tested?

No Tests , as only the tests were removed.

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [ ] I have commented my code following the OpenMined Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests

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[shubham3121]

Closing this as changes were already covered in PR: https://github.com/OpenMined/PySyft/pull/6719