chore(telemetry): code cleanup (#3897)

# What does this PR do?
Clean up telemetry code since the telemetry API has been remove.
- moved telemetry files out of providers to core
- removed from Api

## Test Plan

❯ OTEL_SERVICE_NAME=llama_stack
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318 uv run llama stack run
starter
❯ curl http://localhost:8321/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-4o-mini",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }'

-> verify traces in Grafana

CI

llama_stack/providers/inline/agents/meta_reference/agent_instance.py

@@ -67,6 +67,7 @@ from llama_stack.apis.safety import Safety
 from llama_stack.apis.tools import ToolGroups, ToolInvocationResult, ToolRuntime
 from llama_stack.apis.vector_io import VectorIO
 from llama_stack.core.datatypes import AccessRule
+from llama_stack.core.telemetry import tracing
 from llama_stack.log import get_logger
 from llama_stack.models.llama.datatypes import (
     BuiltinTool,
@@ -78,7 +79,6 @@ from llama_stack.providers.utils.inference.openai_compat import (
     convert_tooldef_to_openai_tool,
 )
 from llama_stack.providers.utils.kvstore import KVStore
-from llama_stack.providers.utils.telemetry import tracing
 
 from .persistence import AgentPersistence
 from .safety import SafetyException, ShieldRunnerMixin

llama_stack/providers/inline/agents/meta_reference/responses/streaming.py

@@ -65,9 +65,9 @@ from llama_stack.apis.inference import (
     OpenAIChoice,
     OpenAIMessageParam,
 )
+from llama_stack.core.telemetry import tracing
 from llama_stack.log import get_logger
 from llama_stack.providers.utils.inference.prompt_adapter import interleaved_content_as_str
-from llama_stack.providers.utils.telemetry import tracing
 
 from .types import ChatCompletionContext, ChatCompletionResult
 from .utils import (

llama_stack/providers/inline/agents/meta_reference/responses/tool_executor.py

@@ -37,8 +37,8 @@ from llama_stack.apis.inference import (
 )
 from llama_stack.apis.tools import ToolGroups, ToolInvocationResult, ToolRuntime
 from llama_stack.apis.vector_io import VectorIO
+from llama_stack.core.telemetry import tracing
 from llama_stack.log import get_logger
-from llama_stack.providers.utils.telemetry import tracing
 
 from .types import ChatCompletionContext, ToolExecutionResult
 

llama_stack/providers/inline/agents/meta_reference/safety.py

@@ -8,8 +8,8 @@ import asyncio
 
 from llama_stack.apis.inference import Message
 from llama_stack.apis.safety import Safety, SafetyViolation, ViolationLevel
+from llama_stack.core.telemetry import tracing
 from llama_stack.log import get_logger
-from llama_stack.providers.utils.telemetry import tracing
 
 log = get_logger(name=__name__, category="agents::meta_reference")