Add the Airflow API URL to the `deployment inspect` output

[ashb]

Our docs currently tell people to get the webserver_url and then manually strip off the org id which is error prone (people forget to do it).

Given that the API already has a field for exactly this lets just expose it for users to use!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.56%. Comparing base (bf3ec8f) to head (15517c5). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1614 +/- ## ======================================= Coverage 86.56% 86.56% ======================================= Files 114 114 Lines 16087 16088 +1 ======================================= + Hits 13925 13926 +1 Misses 1297 1297 Partials 865 865 ```

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