[Backport into 5.18] Remove root secret from pod env variables

[liranmauda]

Explain the changes

Remove root secret from pod env variables

(cherry picked from commit 0154df1)

Issues: Fixed #xxx / Gap #xxx

1. https://issues.redhat.com/browse/DFBUGS-4410

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[dannyzaken]

If I remember correcly, we are not removing any envs that are already set on the Sts\deployment. We should probably see if this env is set and explictly remove/reset it.