message: Remove mention of testing related changes from telemetry changelog
diff: - Aligned OpenTelemetry tracing infrastructure with OpenTelemetry 1.17.0 conventions for use with Azure Monitor.
  ### Other Changes
  -- Updated test collateral to reflect Azure Core tracing changes.
  +
  - Suppress several warnings from opentelemetry-cpp package.
  ## 1.0.0-beta.3 (2022-08-04)
  