Review Open Telemetry settings to expose in admin settings

[Bionic711]

Review for implementation OTEL settings for FlaskInstrumentator to expose via the admin app settings, why they might want/need to be exposed, use cases for exposing each setting, etc.

Ex: OTEL_PYTHON_DISABLED_INSTRUMENTATIONS

[clarked-msft]

Expose OTEL settings.

https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/
https://pypi.org/project/azure-monitor-opentelemetry/

Consider OTEL_SERVICE_NAME, OTEL_LOG_LEVEL and possibly OTEL_PYTHON_DISABLED_INSTRUMENTATIONS.