Add securityContexts in dagProcessor.logGroomerSidecar

[aldwyn]

Closes: #34498

[boring-cyborg]

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[hussein-awala]

Could you add a new test for this change and update the schema of the values file?

[amoghrajesh]

Can you add some unit tests for this change in airflow/helm_tests?

[eladkal]

There are conflicts to resolve

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.