TF-2116 Support expanded/collapsed for Signature in composer

(cherry picked from commit 3ff79dcc8b43b9ae9af0c9b8f5133b5bfd210d18)

pubspec.yaml

@@ -54,7 +54,7 @@ dependencies:
   html_editor_enhanced:
     git:
       url: https://github.com/linagora/html-editor-enhanced.git
-      ref: email_supported
+      ref: improvement/support-expanded-collapsed-signature
 
   jmap_dart_client:
     git:
@@ -232,6 +232,11 @@ dependency_overrides:
 
   pointer_interceptor: 0.9.1
 
+  enough_html_editor:
+    git:
+      url: https://github.com/linagora/enough_html_editor.git
+      ref: improvement/support-expanded-collapsed-signature
+
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec