feat(xo-web/import/disk): UI improvement for ISO files (#6874)

See https://xcp-ng.org/forum/topic/7243

CHANGELOG.unreleased.md

@@ -7,6 +7,8 @@
 
 > Users must be able to say: “Nice enhancement, I'm eager to test it”
 
+- [Import/Disk] Enhance clarity for importing ISO files [Forum#7243](https://xcp-ng.org/forum/topic/7243/can-t-import-iso-through-ova-not-a-supported-filetype?_=1685710667937) (PR [#6874](https://github.com/vatesfr/xen-orchestra/pull/6874))
+
 ### Bug fixes
 
 > Users must be able to say: “I had this issue, happy to know it's fixed”
@@ -27,4 +29,6 @@
 
 <!--packages-start-->
 
+- xo-web minor
+
 <!--packages-end-->