Add configuration_overrides to templated fields

[tlinkin]

Added configuration_overrides to the templated fields, as can be required to be templated in case of changing log_groups and log_prefixes in AWS CloudWatch.

Required templating:

{'monitoringConfiguration': {
  'persistentAppUI': 'ENABLED',
  'cloudWatchMonitoringConfiguration': {
    'logGroupName': '{{ var.value.emr_jobs_log_group }}',
    'logStreamNamePrefix': '{{ task_instance_key_str }}'
  }}}

This change should not impact anything as far as I can tell, just expand the templating of the operator to cover realistic cases.

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[boring-cyborg]

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[boring-cyborg]

Awesome work, congrats on your first merged pull request!