Make snapshot downloads optional after Desktop Wallet upgrades

[GuybrushX]

Which feature is your request related to?

Snapshot download after upgrades

Is your request related to a problem? Please describe.

It is very time consuming to download a snapshot after an upgrade even when this is not necessary.

Describe the solution you'd like:

Make the snapshot download optional with a simple check.

Describe alternatives you've considered:

Stopping the Desktop Wallet shortly after the snapshot download started and restarting the Desktop Wallet seems to work but this could change at any time and risks more issues.

Additional context:

NA