Deployment diffs

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

I and deploying with 'aspire deploy' but I am unaware of infra changes it will make.

### Describe the solution you'd like

I would like to have a diff on planned Azure resource changes. Something like --what-if on ARM templates offers. And have an option to confirm if to proceed or not.

### Additional context

_No response_

Start with the `aspire deploy` command and how it plans Azure resource changes; compare the requested behavior with ARM templates' `--what-if` option. Define how the diff and confirmation step should appear, and verify that deployment can be reviewed and cancelled before changes are applied.

Written by the indexing model from the issue text.