feat(ai-insights): support span.name

[obostjancic]

• closed TET-1908: Support span.name in agent monitoring/conversations
• adds fallbacks from span.description to span.name in Agent monitoring and AI Conversations
• partially refactors getNodeInfo

[linear]

TET-1908 Support span.name in agent monitoring/conversations

[github-actions]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

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