Add ability to delete avatar or header picture via the API (#25124)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/controllers/api/v1/profiles_controller.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class Api::V1::ProfilesController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :write, :'write:accounts' }
+  before_action :require_user!
+  before_action :set_image
+  before_action :validate_image_param
+
+  def destroy
+    @account = current_account
+    UpdateAccountService.new.call(@account, { @image => nil }, raise_error: true)
+    ActivityPub::UpdateDistributionWorker.perform_async(@account.id)
+    render json: @account, serializer: REST::CredentialAccountSerializer
+  end
+
+  private
+
+  def set_image
+    @image = params[:image]
+  end
+
+  def validate_image_param
+    raise(Mastodon::InvalidParameterError, 'Image must be either "avatar" or "header"') unless valid_image?
+  end
+
+  def valid_image?
+    %w(avatar header).include?(@image)
+  end
+end