[Bug] showSubtechniques in SVGConfig does not show the sub techniques in the SVG

Expected Behavior

Expanded sub techniques in SVG

Actual Behavior

SVG is not showing sub techniques, while the attack navigator does

Steps to Reproduce the Problem

1. create a json with:
   layout: "expandedSubtechniques": "all"
   techniques "showSubtechniques": True
   "selectSubtechniquesWithParent": True
2. Validate that the json contains:
   layout: "expandedSubtechniques": "all"
   techniques: "showSubtechniques": true
   "selectSubtechniquesWithParent": true
3. Validate that the json works in attack explorer
4. Import: from mitreattack.navlayers.exporters.to_svg import ToSvg, SVGConfig
5. svgconf =SVGConfig(width=118.9, height=84.1, unit="cm", showHeader=False, fontSize=12, showSubtechniques="all")
6. export with
   exporter = ToSvg(domain='enterprise', source='local', resource=resource_path, config=svgconf)
   exporter.to_svg(layerInit=layer, filepath="Coverage.svg")

Possible Solution

Review > mitreattack.navlayers.exporters.to_svg

Start in mitreattack.navlayers.exporters.to_svg, focusing on SVGConfig and ToSvg.to_svg. Reproduce the issue with showSubtechniques="all" and the supplied layer settings, then compare the generated SVG with the attack navigator output. Done means the SVG includes expanded subtechniques under the described configuration.