Move graph deletion to datapipe

[rvazarkar]

Description

Moves logic for graph deletion to the datapipe to prevent deadlocks

Motivation and Context

The existing logic for clearing the DB was handled by the api handler in resources. However, if concurrent graph modifications were being performed in datapipe, this would lead to graph deadlocks. This MR moves the graph deletion logic into datapipe

https://specterops.atlassian.net/browse/BED-4286

How Has This Been Tested?

Local testing

Screenshots (if appropriate):

Types of changes

• Chore (a change that does not modify the application functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Documentation updates are needed, and have been made accordingly.
• I have added and/or updated tests to cover my changes.
• All new and existing tests passed.
• My changes include a database migration.

[juggernot325]

I did have a couple questions, but it's likely they won't require code changes. I'm preemptively approving under the assumption that nothing further will be needed. If that changes I'll revoke the approval.