Backup all git data, ensure DB is created & seeded

What does this Merge Request do and why?

This MR fixes two bugs when running gdk reset-data:

1. gdk reset-data fails when praefect.node_count is set
2. gdk reset-data no longer creates or seeds database

Closes:

• #1320 (closed)
• #1321 (closed)

Merge Request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise Issue to follow-up.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.