Resolve "12_snippets.rb and 14_pipelines.rb DB seed fails"

What does this Merge Request do and why?

This MR resolves various DB seeds when running gdk reset-data from failing by:

1. Backing up/removing redis/dump.rdb as it causes caching issues (main fix)
2. Updates the template for redis/redis.conf to support persistence (disabled by default)

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.

Closes #1535 (closed)