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Remove firejail conditional

Description

Remove firejail conditional

Now that firejail, graphoid and mathoid have been migrated to firejail
in production, remove the "firejail" conditional in service::node and
use firejailed execution for all upcoming services.

Bug: T101870
Change-Id: I0970967a2eb7e8d9b21ef361d6107702f20e15d1