fix(ci): render infra config (#2223)

Description
Fixes the infrastructure configuration rendering for nested e2e clusters by correcting the YAML structure and the Helm template lookup logic.

Changes:
- Fixed YAML indentation in e2e-reusable-pipeline.yml - moved networkConfig to the correct nesting level
- Fixed _helpers.tpl to properly extract networkConfig from the instances values using get function instead of incorrect dig call

---------------

Signed-off-by: Nikita Korolev <nikita.korolev@flant.com>

Author: universal-itengineer

.github/workflows/e2e-reusable-pipeline.yml

@@ -240,8 +240,8 @@ jobs:
                   size: ${{ inputs.cluster_config_workers_memory }}
                 additionalDisks:
                 - size: 50Gi
-          networkConfig:
-            clusterNetworkName: ${{ inputs.nested_cluster_network_name }}
+            networkConfig:
+              clusterNetworkName: ${{ inputs.nested_cluster_network_name }}
           EOF
 
           mkdir -p tmp

test/dvp-static-cluster/charts/infra/templates/_helpers.tpl

@@ -16,7 +16,9 @@ group: {{ $prefix }}
 {{- $ctx := index . 0 -}}
 {{- $name := index . 1 -}}
 {{- $cfg := index . 2 -}}
-{{- $clusterNetworkName := dig $ctx.Values "networkConfig" "clusterNetworkName" "" -}}
+{{- $networkConfig := get $ctx.Values.instances "networkConfig" | default dict -}}
+{{- $clusterNetworkName := get $networkConfig "clusterNetworkName" | default "" -}}
+
 ---
 apiVersion: virtualization.deckhouse.io/v1alpha2
 kind: VirtualMachine