fix: handle summarize bug + concurrent registrations

[sicoyle]

Description

This PR fixes the concurrent write issue for agent registration by removing the ensure_registry_initialized func as our registration function itself already handles cases where the key doesn't exist as well as when the key exists and we need an update.

It also fixes this one from Alice

Activity task #7 failed: LLM summarize failed: Extraction failed: No tool_calls found for function_call mode

If the LLM returns plain JSON, then we should support JSON here too.

Issue reference

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Please reference the issue this PR closes: #[issue number]

Checklist

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• Created/updated tests
• Tested this change against all the quickstarts
• Extended the documentation
  • Created the dapr/docs PR:

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[sicoyle]

/ok-to-test

[sicoyle]

ignore me ^ just seeing where it's at again 🙃

[github-actions]

Integration Tests Summary

Python Version	Status
3.10	❌ FAILED
3.11	❌ FAILED
3.12	❌ FAILED
3.13	❌ FAILED

Overall Status: ❌ Some tests failed
Workflow: View run