Allow empty description for tracked objects

[hawkeye217]

Proposed change

The Fast API changes set a min length for a string to be 1. This PR allows a blank description to be set for a tracked object. Also fixes a bug where embeddings would not be removed when when deleting events via the API.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• The code has been formatted using Ruff (ruff format frigate)

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