fix: filter out remote::sample providers when listing

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>

llama_stack/cli/stack/list_providers.py

@@ -47,7 +47,7 @@ class StackListProviders(Subcommand):
 
         rows = []
         for spec in providers_for_api.values():
-            if spec.provider_type == "sample":
+            if spec.is_sample:
                 continue
             rows.append(
                 [

llama_stack/providers/datatypes.py

@@ -86,6 +86,10 @@ class ProviderSpec(BaseModel):
     # used internally by the resolver; this is a hack for now
     deps__: List[str] = Field(default_factory=list)
 
+    @property
+    def is_sample(self) -> bool:
+        return self.provider_type in ("sample", "remote::sample")
+
 
 class RoutingTable(Protocol):
     def get_provider_impl(self, routing_key: str) -> Any: ...