Add support for W&B dedicated cloud instances in Weave tracing integration (#20765)

Co-authored-by: crazywoola <427733928@qq.com>

api/core/ops/entities/config_entity.py

@@ -98,6 +98,7 @@ class WeaveConfig(BaseTracingConfig):
     entity: str | None = None
     project: str
     endpoint: str = "https://trace.wandb.ai"
+    host: str | None = None
 
     @field_validator("endpoint")
     @classmethod
@@ -109,6 +110,14 @@ class WeaveConfig(BaseTracingConfig):
 
         return v
 
+    @field_validator("host")
+    @classmethod
+    def validate_host(cls, v, info: ValidationInfo):
+        if v is not None and v != "":
+            if not v.startswith(("https://", "http://")):
+                raise ValueError("host must start with https:// or http://")
+        return v
+
 
 OPS_FILE_PATH = "ops_trace/"
 OPS_TRACE_FAILED_KEY = "FAILED_OPS_TRACE"