Enable do_xcom_push param in KPO example

[pankajastro]

In our KPO example test, we write some dummy data at path /airflow/xcom/return.json
The intention of doing this would be probably to push this data in xcom
but it does not push since do_xcom_push is false.
so either we should set do_xcom_push to true or remove 'echo \'{"message": "good afternoon!"}\' > /airflow/xcom/return.json'

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (05e551b) 98.58% compared to head (527fa5c) 98.58%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1249   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
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  Files          90       90           
  Lines        5390     5390           
=======================================
  Hits         5314     5314           
  Misses         76       76           

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