Output a useful URL to download each plugin

### What feature do you want to see added?

Some organizations need to request outside downloads from an interface shop that has little desire to use client-supplied techniques like the Plugin Manager, and demand a clear, specific URL they can pass to CURL or equivalent.

I'd like to be able to get a valid download URL included in some output form from the Plugin Manager. Such a URL should remain valid for some modest time, such as two weeks.

Including it as a key in the .yaml output would work. Another choice would be another --output format; I suggest file extension .url.

### Upstream changes

_No response_

### Are you interested in contributing this feature?

I would like to; but need to get approval from my employer (they have an extensive policy on this, and are willing to approve if I do the right things.) I am a competent Java programmer.

Start at the Plugin Manager CLI's output handling and existing YAML output path, then compare it with the proposed .url output option. Define the time-limited download URL behavior and verify that the chosen output includes a usable URL for each plugin.

Written by the indexing model from the issue text.