feat(instructeurs/dossiers): add summary to dossier.champs and dossier.champ_private views, also extract summary in

two component. one of type de champ editor. one for viewable champs

app/components/viewable_champ/header_sections_summary_component.rb

@@ -0,0 +1,17 @@
+class ViewableChamp::HeaderSectionsSummaryComponent < ApplicationComponent
+  def initialize(dossier:, is_private:)
+    @dossier = dossier
+    @is_private = is_private
+  end
+
+  def header_sections
+    @dossier.revision
+      .types_de_champ_for(scope: @is_private ? :private : :public)
+      .filter(&:header_section?)
+      .map { @dossier.project_champ(_1, nil) } # row_id not needed, do not link to repetiion header_sections
+  end
+
+  def href(header_section) # used by viewable champs to anchor elements
+    "##{header_section.input_group_id}"
+  end
+end