Document deprecation and add test for smooth update

[abelsiqueira]

Test that when you generate a package in the previous main and then update to the HEAD using only the required data and defaults, that it is the same as generating the package in the HEAD.

Warning: the interactions with other changes is not clear yet.

Closes #428

Related issues

Closes #

Checklist

• [x] I am following the contributing guidelines
• [x] Tests are passing
• [x] Lint workflow is passing
• [x] Docs were updated and workflow is passing
• [x] CHANGELOG.md was updated

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (d9e9ade) to head (c7895a7). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #431 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 4 4 Lines 104 104 ========================================= Hits 104 104 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.