Deprecate float positioning in File and Picture ingredients

[tvdeyen]

What is this pull request for?

Deprecates float positioning in File and Picture ingredients.

If you rely on them, please use css_classes in your ingredient's settings instead.

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message

[codecov[bot]]

Codecov Report

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

Project coverage is 95.95%. Comparing base (70b0d49) to head (c477124).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2894 +/- ## ======================================= Coverage 95.95% 95.95% ======================================= Files 230 230 Lines 6258 6258 ======================================= Hits 6005 6005 Misses 253 253 ```

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