[GONRG-12997] Fix: DF/DE uses default node pool

Oleksandr Kosse (EPAM)requested to merge
okosse into master

The initial_node_count was set to the regular node count, which was also used to determine the count of nodes. This was preventing the autoscaling node pool from scaling up to the desired number of nodes.

This commit disables the regular nodes by setting the initial_node_count to 1. It also creates a regular_node_pool to manage the regular nodes.

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