Relicense all .rake files under new project license.

The primary license of the project is changing to:
  AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later

with some specific files to be licensed under the one of two licenses:
   CC0-1.0
   LGPL-3.0-or-later

This commit is one of the many steps to relicense the entire codebase.

Documentation granting permission for this relicensing (from all past
contributors who hold copyrights) is on file with Software Freedom
Conservancy, Inc.

lib/tasks/civicrm.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 require 'queue_donations'
 
 namespace :civicrm do

lib/tasks/database.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 Rake::Task["db:structure:dump"].clear
 namespace :db do
   namespace :structure do

lib/tasks/full_contact.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 desc "For generating Full Contact data"
 
 # Clear old activerecord sessions tables daily

lib/tasks/health_report.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 desc "For sending an activity report email of what has been happening on the system"
 
 # Clear old activerecord sessions tables daily

lib/tasks/scheduler.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 require 'scheduled_jobs'
 
 desc "For use with Heroku's Scheduler add-on"

lib/tasks/seed.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 namespace :seed do
 
 	task :np => :environment do

lib/tasks/settings.rake

@@ -1,3 +1,4 @@
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 
 namespace :settings do
   task :environment do