feat(backend): Migrate old models in existing agents

[kcze]

Some existing nodes use models that no longer exist as values on LlmModel enum.

Changes 🏗️

• Update non existing models to gpt-4o when loading AgentNode from_db
• Set default models for AI blocks to gpt-4o

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • ...

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[ntindle]

What if we do that here autogpt_platform/backend/backend/server/rest_api.py

@contextlib.asynccontextmanager
async def lifespan_context(app: fastapi.FastAPI):
    await backend.data.db.connect()
    await backend.data.block.initialize_blocks()
    await backend.data.user.migrate_and_encrypt_user_integrations()
    await backend.data.graph.fix_llm_provider_credentials()
    with launch_darkly_context():
        yield
    await backend.data.db.disconnect()

[Swiftyos]

In general happy with this approach. However, I don't feel we should be migrating ai models with clearly communicating it to the user.

Can we add a ticket to push a notification to the user when a model has to be migrated and we can address this at an appropriate time

[github-actions]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.