Resolve "Remove UploadTypeCheck concern"

What does this MR do?

The UploadTypeCheck concern has been superseded by a new concern that filters based on content type rather than matching content type with file extension.

There's no longer a need for the UploadTypeCheck as noted in the MR review.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Closes #208852 (closed)