Add image upload/transform mappings to Site Health

[ironprogrammer]

For plugins and userland code that utilize the ​`image_editor_output_format` filter, it may not be clear to site operators what the final transforms are. This enhancement proposes adding the final upload->transform mappings information to the Site Health > Info tab, possibly under the existing "Media Handling" section. Displaying these mappings could prove useful, particularly when debugging final image output.

The motivation for this update comes from experiencing unexpected mappings, as reported in #62365.

Related: #62365.

Trac ticket: https://core.trac.wordpress.org/ticket/63047

## Description

Adds visibility into image_editor_output_format filter transformations by displaying active format mappings in Site Health > Info > Media Handling section.

### Testing

Visit Site Health > Info > Media Handling section to verify the transform mappings display.

### Screenshots

_No Transform Applied_

_Multiple Transforms Applied_

[adamsilverstein]

@ironprogrammer looks good! I tested using playground and left some small feedback, otherwise seems like a nice addition - thanks!

[ironprogrammer]

Thanks for the PR, @yogeshbhutkar, and for reviewing it, @adamsilverstein! To be clear, this work was performed by @yogeshbhutkar, who gets the credit there 😉 Following Adam's suggestion, the update looks good from my perspective.

[yogeshbhutkar]

Thanks, both! I've updated the patch to ensure consistent casing.