When dumping trim the standard suffices instead of a random suffix (#19440) (#19447)

When dumping trim the standard suffices instead of a random suffix (#19440) (#19447)

* When dumping trim the standard suffices instead of a random suffix

Instead of using the `path.Ext()` to trim the last "extension" suffix, just iterate
through the supported suffices and trim those.

Fix #19424

Signed-off-by: Andrew Thornton <art27@cantab.net>
* fix enum with to have correct supported types only

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: zeripath <art27@cantab.net>