feat(perf): sla-9 improve perf of TriggerSlasForAccountsJob (#8953)

* feat: improve perf of TriggerSlasForAccountsJob

enterprise/app/jobs/sla/trigger_slas_for_accounts_job.rb

@@ -2,7 +2,7 @@ class Sla::TriggerSlasForAccountsJob < ApplicationJob
   queue_as :scheduled_jobs
 
   def perform
-    Account.find_each do |account|
+    Account.joins(:sla_policies).distinct.find_each do |account|
       Rails.logger.info "Enqueuing ProcessAccountAppliedSlasJob for account #{account.id}"
       Sla::ProcessAccountAppliedSlasJob.perform_later(account)
     end

spec/enterprise/jobs/sla/trigger_slas_for_accounts_job_spec.rb

@@ -1,16 +1,25 @@
 require 'rails_helper'
-
 RSpec.describe Sla::TriggerSlasForAccountsJob do
   context 'when perform is called' do
-    let(:account) { create(:account) }
+    let(:account_with_sla) { create(:account) }
+    let(:account_without_sla) { create(:account) }
+
+    before do
+      create(:sla_policy, account: account_with_sla)
+    end
 
     it 'enqueues the job' do
       expect { described_class.perform_later }.to have_enqueued_job(described_class)
         .on_queue('scheduled_jobs')
     end
 
-    it 'calls the ProcessAccountAppliedSlasJob' do
-      expect(Sla::ProcessAccountAppliedSlasJob).to receive(:perform_later).with(account).and_call_original
+    it 'calls the ProcessAccountAppliedSlasJob for accounts with SLA' do
+      expect(Sla::ProcessAccountAppliedSlasJob).to receive(:perform_later).with(account_with_sla).and_call_original
+      described_class.perform_now
+    end
+
+    it 'does not call the ProcessAccountAppliedSlasJob for accounts without SLA' do
+      expect(Sla::ProcessAccountAppliedSlasJob).not_to receive(:perform_later).with(account_without_sla)
       described_class.perform_now
     end
   end