[BUG] Open Telemetry and tracing token error

[Malagurti]

Describe the bug
Two related issues in token collection:

AttributeError: 'TokenCollector' object has no attribute 'try_get_openai_tokens'
OpenTelemetry warnings about invalid token value types (dict and NoneType values where numeric values are expected)

How To Reproduce the bug
Steps to reproduce the behavior:

Run any LLM flow with token tracking enabled
The error occurs consistently on every run
Check logs for OpenTelemetry warnings about invalid attribute types
Flow execution fails with AttributeError for try_get_openai_tokens

Expected behavior

TokenCollector should properly track and collect token usage
Token values should be properly typed (numeric values)
No OpenTelemetry warnings about invalid types
No AttributeErrors during token collection

Screenshots
Error logs show:
CopyWARNING:opentelemetry.attributes:Invalid type dict for attribute 'computed.cumulative_token_count.completion'
...
TypeError: unsupported operand type(s) for +: 'NoneType' and 'dict'
...
AttributeError: 'TokenCollector' object has no attribute 'try_get_openai_tokens'
Running Information

Promptflow Package Version: 1.16
Operating System: Windows
Python Version: Python 3.9

Additional context

Issue appears related to token tracking in tracing functionality
Occurs with Azure OpenAI service integration
Problem stems from method indentation error and inconsistent type handling
Affects both streaming and non-streaming LLM calls