Fix internal class being returned from media cache service

[matthewcare]

Return the correct models from the media cache service

Fixes #17204

[github-actions]

Hi there @matthewcare, thank you for this contribution! 👍

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[mikecp]

Hi @matthewcare,

Thanks a lot for spotting the issue and providing the fix for it 🤩👍

I noticed that you targeted the branch v15/dev, but we expect the contribuions from our community members to be targeting the contrib branch 😅
So it would be super great if you could retarget your PR, and then someone from the core collaborators team will have a look at it.

Thanks and cheers!

[matthewcare]

Hey no worries, I've retargeted

[bergmania]

Thanks for contributing. We must have missed this one, when we did it for content. Code changes looks good to me

[bergmania]

Cherry picked for 15.0.0-rc2 here ea073e6

[nul800sebastiaan]

Thanks again @matthewcare!

Just a hint: as you may know, this PR qualifies for Umbraco's Hacktoberfest participation for which you can earn rewards.
If you were to make 1 more contribution in the next few days, would be great to see your contributions qualify! You can do it.. 😉