Fix files/blob api endpoint content disposition

What does this MR do?

In the current codebase the Content-Disposition is set to attachment, but this has brought some problems to users.

In order to fix this, we're following the same approach we apply with the RawController, let Workhorse determine the Content-Disposition. By default, the disposition is set to inline, and if Workhorse detects that the file content shouldn't be inlined it will change it to attachment.

What are the relevant issue numbers?

Closes #55882 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer