Update the install-dynamic-plugins.py script to extract catalog index 

directly to /dynamic-plugins-root volume when CATALOG_INDEX_IMAGE is set.

Changes:

• Change 'r:gz' to 'r:*' for tar auto-detection
• Set extraction path to a temp dir e.g. /tmp temporary inside the dynamicPluginsRoot delete after.
• Add extract_catalog_index() function

Acceptance Criteria:

• Script writes dynamic-plugins.default.yaml to a temp dir e.g. /tmp 
• Tar auto-detection handles different compression formats
• Catalog index automatically prepended to includes when CATALOG_INDEX_IMAGE is set
• Backwards compatible when CATALOG_INDEX_IMAGE is not set