Delete deprecated `MediaType` class

[marcphilipp]

Follow-up on #4886 to fully resolve the package cycle. This change should not be backported to 5.x.

Deliverables

• Delete deprecated MediaType class

[mehulimukherjee]

Hi @marcphilipp ,
Could you please assign this also to me? Getting used to the code base, and looking forward to make more changes.
Thank you,
Mehuli

[marcphilipp]

@mehulimukherjee I'm afraid this one is blocked by #4885 and I already have a local branch prepared.

[mehulimukherjee]

Hi @marcphilipp , no worries, Anything else you want me to work on, let me know 🙂