[FIX] http,web,website_*: return the correct Content-Type for images

* = website_profile, website_slides

Before this commit, the returned Content-Type was not always correct, for
example if the image tool was changing the format, which happens when given
a BMP (converted to PNG), or other types being converted to JPEG.

The previous method `force_contenttype` was too specific and it wasn't available
in every controller. It didn't even need to be a controller method because it
didn't use self.

Now we create a generic helper to ease updating headers.
The Content-Type is only updated when it is safe to do. It is especially unsafe
for example for SVG files.

task-1958000
PR: #31811

0 files changed, 0 insertions, 0 deletions