record deleted courses through full batch sis imports

test plan:
* enable sis imports for the root account
* import a course through a sis import
* re-import a sis import without the course
 using "full batch update", which will cause
 the course to be deleted
* in the course activity log, it should record that
 the course was deleted

closes #CNVS-30070

Change-Id: I4e1cd8091fc11ab88dab8f2987ecfcec0b4fa731
Reviewed-on: https://gerrit.instructure.com/82990
Reviewed-by: Steven Burnett <sburnett@instructure.com>
Tested-by: Jenkins
QA-Review: Deepeeca Soundarrajan <dsoundarrajan@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>

app/models/sis_batch.rb

@@ -276,6 +276,9 @@ class SisBatch < ActiveRecord::Base
       course.clear_sis_stickiness(:workflow_state)
       course.skip_broadcasts = true
       course.destroy
+
+      Auditors::Course.record_deleted(course, self.user, :source => :sis, :sis_batch => self)
+
       current_row += 1
       self.fast_update_progress(current_row.to_f/total_rows * 100)
     end

spec/models/sis_batch_spec.rb

@@ -390,6 +390,7 @@ s2,test_1,section2,active},
       expect(@course.reload).to be_claimed
       expect(b.data[:counts][:batch_sections_deleted]).to eq 1
 
+      Auditors::Course.expects(:record_deleted).once.with(@course, anything, anything)
       # only supply courses
       b = process_csv_data(
         [%{course_id,short_name,long_name,term_id}],