Vb/fix ontology leaks plt 1379

[vbrodsky]

Description

Story: https://labelbox.atlassian.net/browse/PLT-1379

Our sdk integration tests do not delete any schema nodes and as a result we 'leak' about 1,600 schema nodes per run. Original goal of this story was to delete all schema nodes, but it turns out our api has limitation in that it only deletes root nodes.

I have refactored code and added a helper to project fixtures to cleanup project and all it's dependencies including schema nodes. Unfortunately it will not result in drastic reduction of leaked schema nodes as per above.

Still, if and when the api supports deletion of all schema nodes, test update will be easy

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• Document change (fix typo or modifying any markdown files, code comments or anything in the examples folder only)

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Changes to Core Features

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[vbrodsky]

used ruff to delete unused imports