fix(core): clean up variables when committing a user turn manually

[rosetta-livekit-bot]

• reset turn related variables
• end turn span

[changeset-bot]

⚠️ No Changeset found

Latest commit: 45ea65b

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.