refactor: remove unused import in telemetry

Remove unused NoOpTracerProvider import from tracer.py.
This import was not being used in the module.

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: vilsonrodrigues

src/msgflux/telemetry/tracer.py

@@ -6,7 +6,6 @@
 from opentelemetry.sdk.trace import TracerProvider
 from opentelemetry.sdk.trace.export import BatchSpanProcessor, ConsoleSpanExporter
 from opentelemetry.sdk.trace.sampling import ParentBased, TraceIdRatioBased
-from opentelemetry.trace import NoOpTracerProvider
 
 from msgflux.envs import envs
 from msgflux.logger import logger