fix(langchain): Set agent name as gen_ai.agent.name for chat and tool spans
#7171
| Job | Run time |
|---|---|
| 4m 5s | |
| 2m 11s | |
| 1m 49s | |
| 2m 38s | |
| 1m 44s | |
| 3m 17s | |
| 1m 36s | |
| 3m 38s | |
| 4s | |
| 21m 2s |