Reload should tell us if restart is required

### Proposal
Make it so that when we do a nomad reload we get some useful information:
- Verify the config before doing anything, if valid proceed.
- Verify the changes will apply after a reload, if not proceed, but inform us that a restart is required for some of the changes.

### Use-cases
Clean approach whenever someone is updating node configurations for nomad. This is mostly a quality of life thing.

### Attempted Solutions
N/A

Start at the Nomad reload command and trace how configuration is currently verified and applied. Determine how to report changes that cannot take effect through reload while preserving the requested validation-before-action behavior. Done means reload validates first, applies reloadable changes, and clearly reports when a restart is required.

Written by the indexing model from the issue text.