fix(langchain): Set agent name as gen_ai.agent.name for chat and tool spans
#7170
| Job | Run time |
|---|---|
| 2m 45s | |
| 1m 48s | |
| 1m 39s | |
| 2m 39s | |
| 2m 31s | |
| 2m 32s | |
| 1m 53s | |
| 2m 44s | |
| 2s | |
| 18m 33s |