Make Python autoinstrumentation envvar injection consistent with other languages by using appendOrReplace

[BradenChapman]

Signed-off-by: Braden Chapman braden.chapman@chicagotrading.com

Description: Updated Python environment variable injection for autoinstrumentation to use appendOrReplace() instead of appendIfNotSet(). Other languages use appendOrReplace().

Users at my company deploy their applications into kubernetes using Helm. In the Helm chart, we have the following set:

• name: OTEL_EXPORTER_OTLP_ENDPOINT
  value: "http://$(NODE_IP):4317"
• name: OTEL_EXPORTER_OTLP_PROTOCOL
  value: "grpc"
  But Python cannot use grpc. When attempting to override the variables in the helm chart by setting them in the Instrumentation object to be used by the autoinstrumentation injection, the helm chart variables take precedent because the Python injection in the operator currently uses appendIfNotSet, whereas other languages use appendOrReplace.

[linux-foundation-easycla]

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[atoulme]

Moving to draft while you work out the CLA. Please be advised this change is likely not workable as it would break existing environments. Specifically, PYTHONPATH is special for Python. You'll need a changelog and check the tests.